CISCO-SA-CIMC-AUTH-BYPASS-AGG2BXTN

Vulnerability from csaf_cisco - Published: 2026-04-01 16:00 - Updated: 2026-04-01 16:00
Summary
Cisco Integrated Management Controller Authentication Bypass Vulnerability
Notes
Summary: A vulnerability in the change password functionality of Cisco Integrated Management Controller (IMC) could allow an unauthenticated, remote attacker to bypass authentication and gain access to the system as Admin. This vulnerability is due to incorrect handling of password change requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to bypass authentication, alter the passwords of any user on the system, including an Admin user, and gain access to the system as that user. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
Vulnerable Products: This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco IMC, regardless of device configuration: 5000 Series Enterprise Network Compute Systems (ENCS) (CSCwq55648 ["https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq55648"]) Catalyst 8300 Series Edge uCPE (CSCwq68912 ["https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq68912"]) UCS C-Series M5 and M6 Rack Servers in standalone mode (CSCwq55659 ["https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq55659"]) UCS E-Series Servers M3 (CSCwq55648 ["https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq55648"]) UCS E-Series Servers M6 (CSCwq68912 ["https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq68912"]) Cisco appliances that are based on a preconfigured version of one of the Cisco UCS C-Series Servers that are in the preceding list are also affected by this vulnerability if they expose access to the Cisco IMC UI. This includes the following Cisco products: Application Policy Infrastructure Controller (APIC) Servers Business Edition 6000 and 7000 Appliances Catalyst Center Appliances Cisco Telemetry Broker Appliances Cloud Services Platform (CSP) 5000 Series Common Services Platform Collector (CSPC) Appliances Connected Mobile Experiences (CMX) Appliances Connected Safety and Security UCS Platform Series Servers Cyber Vision Center Appliances Expressway Series Appliances HyperFlex Edge Nodes HyperFlex Nodes in HyperFlex Datacenter without Fabric Interconnect (DC-No-FI) deployment mode IEC6400 Edge Compute Appliances IOS XRv 9000 Appliances Meeting Server 1000 Appliances Nexus Dashboard Appliances Prime Infrastructure Appliances Prime Network Registrar Jumpstart Appliances Secure Endpoint Private Cloud Appliances Secure Firewall Management Center Appliances Secure Malware Analytics Appliances Secure Network Analytics Appliances Secure Network Server Appliances Secure Workload Servers For information about which Cisco software releases are vulnerable, see the Fixed Software ["#fs"] section of this advisory.
Products Confirmed Not Vulnerable: Only products listed in the Vulnerable Products ["#vp"] section of this advisory are known to be affected by this vulnerability. Cisco has determined that this vulnerability does not affect the following Cisco products: UCS B-Series Blade Servers UCS C-Series M7 and M8 Rack Servers in standalone mode UCS C-Series Rack Servers with Fabric Interconnects in UCS Manager or Intersight Managed Mode (IMM) UCS S-Series Storage Servers UCS X-Series Modular System Unified Edge
Workarounds: There are no workarounds that address this vulnerability.
Fixed Software: Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To fully remediate these vulnerabilities and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory. Fixed Releases In the following tables, the left column lists Cisco software releases. The right column indicates whether a release is affected by the vulnerability that is described in this advisory and the first release that includes the fix for this vulnerability. Customers are advised to upgrade to an appropriate fixed software release ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"] as indicated in this section. 5000 Series ENCS and Catalyst 8300 Series Edge uCPE Note: Upgrading Cisco IMC on Cisco 5000 Series ENCS and Cisco Catalyst 8300 Series Edge uCPE requires upgrading Cisco Enterprise NFV Infrastructure Software (NFVIS) on the platforms. Cisco IMC is upgraded as part of the firmware auto-upgrade process. Cisco NFVIS Release First Fixed Release for Cisco 5000 Series ENCS 4.15 and earlier 4.15.5 Cisco NFVIS Release First Fixed Release for Cisco Catalyst 8300 Series Edge uCPE 4.16 and earlier Migrate to a fixed release. 4.18 4.18.3 (Apr 2026) 26.1 Not vulnerable. UCS C-Series M5 Rack Server Cisco IMC Release First Fixed Release 4.2 and earlier Migrate to a fixed release. 4.3 4.3(2.260007) UCS C-Series M6 Rack Server Cisco IMC Release First Fixed Release 4.2 and earlier Migrate to a fixed release. 4.3 4.3(6.260017) 6.0 6.0(1.250174) UCS E-Series M3 Cisco IMC Release First Fixed Release 3.2 and earlier 3.2.17 UCS E-Series M6 Cisco IMC Release First Fixed Release 4.15 and earlier 4.15.3 Note: For Cisco appliances that are based on a preconfigured version of a Cisco UCS C-Series Server, administrators can perform a direct upgrade of Cisco IMC to one of the fixed releases mentioned in the preceding tables. For instructions, see the Cisco Host Upgrade Utility (HUU) User Guide ["https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/lomug/4-2/b_cisco-host-upgrade-utility-user-guide-4-2/m_upgrading-the-firmware.html"]. The exceptions are the appliances that are listed in the following table. For these appliances, follow the instructions in the Remediation column: Cisco Hardware Platform First Fixed Cisco IMC Release Remediation Cisco Telemetry Broker Appliances 6.0(1.250192) (M6) Apply the firmware update m6-tb2300-ctb-firmware-6.0-1.250192.iso ["https://www.cisco.com/c/dam/en/us/td/docs/security/Telemetry_Broker/Release-Notes/m6-tb2300-ctb-firmware-6_0-1_250192_iso_DV_1_0.pdf"]. IEC6400 Edge Compute Appliances 4.3(6.260017) (M6) Apply the HUU upgrade using IEC6400-HUU-4.3.6.img ["https://software.cisco.com/download/home/286331621/type/286331613/release/HUU%204.3.6"]. Secure Endpoint Private Cloud Appliances 4.3(2.260007) (M5) 4.3(6.260017) (M6) Upgrade to Release 4.2.5 or later, then follow the steps in the TechNote ["https://www.cisco.com/c/en/us/support/docs/security/secure-endpoint-private-cloud/222008-cisco-secure-endpoint-private-cloud-firm.html"]. Secure Firewall Management Center Appliances 4.3(2.260007) (M5) 4.3(6.260017) (M6) Apply Hotfix FX ["https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/release-notes/threat-defense/hotfix/threat-defense-release-notes-hotfix.html#Cisco_Reference.dita_e5a104de-579f-48b7-adb6-0a72dc5183b7"]. Secure Malware Analytics Appliances 4.3(2.260007) (M5) 4.3(6.260017) (M6) Update the firmware using the Out-of-Band Firmware Update ISO ["https://www.cisco.com/c/en/us/td/docs/security/secure-malware-analytics/admin-guide/v2-19/secure-malware-analytics-guide/m_oob-update-firmware.html"] procedure. Secure Network Analytics Appliances 4.3(2.260007) (M5) 6.0(1.250192) (M6) For M5, install patch-common-SNA-FIRMWARE-20260210-M5-REL.iso ["https://www.cisco.com/c/dam/en/us/td/docs/security/stealthwatch/cimc_bios/7_5_3_M5_CIMC_firmware_4_3_2_260007_readme_DV_1_0.pdf"]. For M6, install patch-common-SNA-FIRMWARE-20260210-M6-REL.iso ["https://www.cisco.com/c/dam/en/us/td/docs/security/stealthwatch/cimc_bios/7_5_3_M6_CIMC_firmware_6_0_1_250192_readme_DV_1_0.pdf"]. Secure Network Server Appliances 4.3(2.260007) (M5) 4.3(6.260017) (M6) 6.0(1.250174) (M6) Apply the BIOS and HUU upgrade as documented in the Firmware Upgrade Guide for Cisco Secure Network Server 3600 Series ["https://www.cisco.com/c/en/us/td/docs/security/ise/sns3600hig/sns-36xx-firmware-4-x-xx_upgrade_guide.html#Cisco_Concept.dita_3e2c957e-62e6-4b2d-9f76-96ad121f29e1"] or Cisco Secure Network Server 3700 Series ["https://www.cisco.com/c/en/us/td/docs/security/ise/sns3700hig/sns-37xx-firmware-4-x-xx_upgrade_guide.html#r_overview"]. The Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.
Vulnerability Policy: To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy ["http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
Exploitation and Public Announcements: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Source: Cisco would like to thank the security researcher jyh for reporting this vulnerability.
Legal Disclaimer: SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT The Cisco Support and Downloads ["https://www.cisco.com/c/en/us/support/index.html"] page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid. Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) ["https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"]. Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. When considering software upgrades ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"], customers are advised to regularly consult the advisories ["https://www.cisco.com/go/psirt"] for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) ["https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"] or their contracted maintenance providers. LEGAL DISCLAIMER DETAILS CISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. Copies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories ["https://www.cisco.com/go/psirt"] page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy ["https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"] for more information.
CVE-2026-20093
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vendor Fix Cisco has released software updates that address this vulnerability. https://software.cisco.com
References
Acknowledgments
To clipboard 

{
  "document": {
    "acknowledgments": [
      {
        "summary": "Cisco would like to thank the security researcher jyh for reporting this vulnerability."
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability in the change password functionality of Cisco Integrated Management Controller (IMC) could allow an unauthenticated, remote attacker to bypass authentication and gain access to the system as Admin.\r\n\r\nThis vulnerability is due to incorrect handling of password change requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to bypass authentication, alter the passwords of any user on the system, including an Admin user, and gain access to the system as that user.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco IMC, regardless of device configuration:\r\n\r\n5000 Series Enterprise Network Compute Systems (ENCS) (CSCwq55648 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq55648\"])\r\nCatalyst 8300 Series Edge uCPE (CSCwq68912 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq68912\"])\r\nUCS C-Series M5 and M6 Rack Servers in standalone mode (CSCwq55659 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq55659\"])\r\nUCS E-Series Servers M3 (CSCwq55648 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq55648\"])\r\nUCS E-Series Servers M6 (CSCwq68912 [\"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq68912\"])\r\n\r\nCisco appliances that are based on a preconfigured version of one of the Cisco UCS C-Series Servers that are in the preceding list are also affected by this vulnerability if they expose access to the Cisco IMC UI. This includes the following Cisco products:\r\n\r\nApplication Policy Infrastructure Controller (APIC) Servers\r\nBusiness Edition 6000 and 7000 Appliances\r\nCatalyst Center Appliances\r\nCisco Telemetry Broker Appliances\r\nCloud Services Platform (CSP) 5000 Series\r\nCommon Services Platform Collector (CSPC) Appliances\r\nConnected Mobile Experiences (CMX) Appliances\r\nConnected Safety and Security UCS Platform Series Servers\r\nCyber Vision Center Appliances\r\nExpressway Series Appliances\r\nHyperFlex Edge Nodes\r\nHyperFlex Nodes in HyperFlex Datacenter without Fabric Interconnect (DC-No-FI) deployment mode\r\nIEC6400 Edge Compute Appliances\r\nIOS XRv 9000 Appliances\r\nMeeting Server 1000 Appliances\r\nNexus Dashboard Appliances\r\nPrime Infrastructure Appliances\r\nPrime Network Registrar Jumpstart Appliances\r\nSecure Endpoint Private Cloud Appliances\r\nSecure Firewall Management Center Appliances\r\nSecure Malware Analytics Appliances\r\nSecure Network Analytics Appliances\r\nSecure Network Server Appliances\r\nSecure Workload Servers\r\n\r\nFor information about which Cisco software releases are vulnerable, see the Fixed Software [\"#fs\"] section of this advisory.",
        "title": "Vulnerable Products"
      },
      {
        "category": "general",
        "text": "Only products listed in the Vulnerable Products [\"#vp\"] section of this advisory are known to be affected by this vulnerability.\r\n\r\nCisco has determined that this vulnerability does not affect the following Cisco products:\r\n\r\nUCS B-Series Blade Servers\r\nUCS C-Series M7 and M8 Rack Servers in standalone mode\r\nUCS C-Series Rack Servers with Fabric Interconnects in UCS Manager or Intersight Managed Mode (IMM)\r\nUCS S-Series Storage Servers\r\nUCS X-Series Modular System\r\nUnified Edge",
        "title": "Products Confirmed Not Vulnerable"
      },
      {
        "category": "general",
        "text": "There are no workarounds that address this vulnerability.",
        "title": "Workarounds"
      },
      {
        "category": "general",
        "text": "Cisco considers any workarounds and mitigations (if applicable) to be temporary solutions until an upgrade to a fixed software release is available. To fully remediate these vulnerabilities and avoid future exposure as described in this advisory, Cisco strongly recommends that customers upgrade to the fixed software indicated in this advisory.\r\n      Fixed Releases\r\nIn the following tables, the left column lists Cisco software releases. The right column indicates whether a release is affected by the vulnerability that is described in this advisory and the first release that includes the fix for this vulnerability. Customers are advised to upgrade to an appropriate fixed software release [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"] as indicated in this section.\r\n\r\n5000 Series ENCS and Catalyst 8300 Series Edge uCPE\r\n\r\nNote: Upgrading Cisco IMC on Cisco 5000 Series ENCS and Cisco Catalyst 8300 Series Edge uCPE requires upgrading Cisco Enterprise NFV Infrastructure Software (NFVIS) on the platforms. Cisco IMC is upgraded as part of the firmware auto-upgrade process.\r\n        Cisco NFVIS Release  First Fixed Release for Cisco 5000 Series ENCS          4.15 and earlier  4.15.5\r\n         Cisco NFVIS Release  First Fixed Release for Cisco Catalyst 8300 Series Edge uCPE          4.16 and earlier  Migrate to a fixed release.      4.18  4.18.3 (Apr 2026)      26.1  Not vulnerable.\r\nUCS C-Series M5 Rack Server\r\n        Cisco IMC Release  First Fixed Release          4.2 and earlier  Migrate to a fixed release.      4.3  4.3(2.260007)\r\nUCS C-Series M6 Rack Server\r\n        Cisco IMC Release  First Fixed Release          4.2 and earlier  Migrate to a fixed release.      4.3  4.3(6.260017)      6.0  6.0(1.250174)\r\nUCS E-Series M3\r\n        Cisco IMC Release  First Fixed Release          3.2 and earlier  3.2.17\r\nUCS E-Series M6\r\n        Cisco IMC Release  First Fixed Release          4.15 and earlier  4.15.3\r\nNote: For Cisco appliances that are based on a preconfigured version of a Cisco UCS C-Series Server, administrators can perform a direct upgrade of Cisco IMC to one of the fixed releases mentioned in the preceding tables. For instructions, see the Cisco Host Upgrade Utility (HUU) User Guide [\"https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/lomug/4-2/b_cisco-host-upgrade-utility-user-guide-4-2/m_upgrading-the-firmware.html\"]. The exceptions are the appliances that are listed in the following table. For these appliances, follow the instructions in the Remediation column:\r\n        Cisco Hardware Platform  First Fixed Cisco IMC Release  Remediation          Cisco Telemetry Broker Appliances  6.0(1.250192) (M6)  Apply the firmware update m6-tb2300-ctb-firmware-6.0-1.250192.iso [\"https://www.cisco.com/c/dam/en/us/td/docs/security/Telemetry_Broker/Release-Notes/m6-tb2300-ctb-firmware-6_0-1_250192_iso_DV_1_0.pdf\"].      IEC6400 Edge Compute Appliances  4.3(6.260017) (M6)  Apply the HUU upgrade using IEC6400-HUU-4.3.6.img [\"https://software.cisco.com/download/home/286331621/type/286331613/release/HUU%204.3.6\"].      Secure Endpoint Private Cloud Appliances  4.3(2.260007) (M5)\r\n4.3(6.260017) (M6)  Upgrade to Release 4.2.5 or later, then follow the steps in the TechNote [\"https://www.cisco.com/c/en/us/support/docs/security/secure-endpoint-private-cloud/222008-cisco-secure-endpoint-private-cloud-firm.html\"].      Secure Firewall Management Center Appliances  4.3(2.260007) (M5)\r\n4.3(6.260017) (M6)  Apply Hotfix FX [\"https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/release-notes/threat-defense/hotfix/threat-defense-release-notes-hotfix.html#Cisco_Reference.dita_e5a104de-579f-48b7-adb6-0a72dc5183b7\"].      Secure Malware Analytics Appliances  4.3(2.260007) (M5)\r\n4.3(6.260017) (M6)  Update the firmware using the Out-of-Band Firmware Update ISO [\"https://www.cisco.com/c/en/us/td/docs/security/secure-malware-analytics/admin-guide/v2-19/secure-malware-analytics-guide/m_oob-update-firmware.html\"] procedure.      Secure Network Analytics Appliances  4.3(2.260007) (M5)\r\n6.0(1.250192) (M6)  For M5, install patch-common-SNA-FIRMWARE-20260210-M5-REL.iso [\"https://www.cisco.com/c/dam/en/us/td/docs/security/stealthwatch/cimc_bios/7_5_3_M5_CIMC_firmware_4_3_2_260007_readme_DV_1_0.pdf\"].\r\nFor M6, install patch-common-SNA-FIRMWARE-20260210-M6-REL.iso [\"https://www.cisco.com/c/dam/en/us/td/docs/security/stealthwatch/cimc_bios/7_5_3_M6_CIMC_firmware_6_0_1_250192_readme_DV_1_0.pdf\"].      Secure Network Server Appliances  4.3(2.260007) (M5)\r\n4.3(6.260017) (M6)\r\n6.0(1.250174) (M6)  Apply the BIOS and HUU upgrade as documented in the Firmware Upgrade Guide for Cisco Secure Network Server 3600 Series [\"https://www.cisco.com/c/en/us/td/docs/security/ise/sns3600hig/sns-36xx-firmware-4-x-xx_upgrade_guide.html#Cisco_Concept.dita_3e2c957e-62e6-4b2d-9f76-96ad121f29e1\"] or Cisco Secure Network Server 3700 Series [\"https://www.cisco.com/c/en/us/td/docs/security/ise/sns3700hig/sns-37xx-firmware-4-x-xx_upgrade_guide.html#r_overview\"].\r\nThe Cisco Product Security Incident Response Team (PSIRT) validates only the affected and fixed release information that is documented in this advisory.",
        "title": "Fixed Software"
      },
      {
        "category": "general",
        "text": "To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy [\"http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html\"]. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.",
        "title": "Vulnerability Policy"
      },
      {
        "category": "general",
        "text": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.",
        "title": "Exploitation and Public Announcements"
      },
      {
        "category": "general",
        "text": "Cisco would like to thank the security researcher jyh for reporting this vulnerability.",
        "title": "Source"
      },
      {
        "category": "legal_disclaimer",
        "text": "SOFTWARE DOWNLOADS AND TECHNICAL SUPPORT\r\n\r\nThe Cisco Support and Downloads [\"https://www.cisco.com/c/en/us/support/index.html\"] page on Cisco.com provides information about licensing and downloads. This page can also display customer device support coverage for customers who use the My Devices tool. Please note that customers may download only software that was procured from Cisco directly or through a Cisco authorized reseller or partner and for which the license is still valid.\r\n\r\nCustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco Technical Assistance Center (TAC) [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"]. Customers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.\r\n\r\nWhen considering software upgrades [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"], customers are advised to regularly consult the advisories [\"https://www.cisco.com/go/psirt\"] for the relevant Cisco products to determine exposure and a complete upgrade solution. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) [\"https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html\"] or their contracted maintenance providers.\r\n    LEGAL DISCLAIMER DETAILS\r\n\r\nCISCO DOES NOT MAKE ANY EXPRESS OR IMPLIED GUARANTEES OR WARRANTIES OF ANY KIND, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. WITHOUT LIMITING THE GENERALITY OF THE FOREGOING, CISCO DOES NOT GUARANTEE THE ACCURACY OR COMPLETENESS OF THIS INFORMATION. THIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.\r\n\r\nCopies or summaries of the information contained in this Security Advisory may lack important information or contain factual errors. Customers are advised to visit the Cisco Security Advisories [\"https://www.cisco.com/go/psirt\"] page for the most recent version of this Security Advisory. The Cisco Product Security Incident Response Team (PSIRT) assesses only the affected and fixed release information that is documented in this advisory. See the Cisco Security Vulnerability Policy [\"https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes\"] for more information.",
        "title": "Legal Disclaimer"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@cisco.com",
      "issuing_authority": "Cisco PSIRT",
      "name": "Cisco",
      "namespace": "https://wwww.cisco.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "Cisco Integrated Management Controller Authentication Bypass Vulnerability",
        "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cimc-auth-bypass-AgG2BxTn"
      },
      {
        "category": "external",
        "summary": "Cisco Security Vulnerability Policy",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "CSCwq55648",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq55648"
      },
      {
        "category": "external",
        "summary": "CSCwq68912",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq68912"
      },
      {
        "category": "external",
        "summary": "CSCwq55659",
        "url": "https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq55659"
      },
      {
        "category": "external",
        "summary": "fixed software release",
        "url": "https://sec.cloudapps.cisco.com/security/center/resources/security_vulnerability_policy.html#fixes"
      },
      {
        "category": "external",
        "summary": "Cisco Host Upgrade Utility (HUU) User Guide",
        "url": "https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/lomug/4-2/b_cisco-host-upgrade-utility-user-guide-4-2/m_upgrading-the-firmware.html"
      },
      {
        "category": "external",
        "summary": "m6-tb2300-ctb-firmware-6.0-1.250192.iso",
        "url": "https://www.cisco.com/c/dam/en/us/td/docs/security/Telemetry_Broker/Release-Notes/m6-tb2300-ctb-firmware-6_0-1_250192_iso_DV_1_0.pdf"
      },
      {
        "category": "external",
        "summary": "IEC6400-HUU-4.3.6.img",
        "url": "https://software.cisco.com/download/home/286331621/type/286331613/release/HUU%204.3.6"
      },
      {
        "category": "external",
        "summary": "TechNote",
        "url": "https://www.cisco.com/c/en/us/support/docs/security/secure-endpoint-private-cloud/222008-cisco-secure-endpoint-private-cloud-firm.html"
      },
      {
        "category": "external",
        "summary": "Hotfix FX",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/secure-firewall/release-notes/threat-defense/hotfix/threat-defense-release-notes-hotfix.html#Cisco_Reference.dita_e5a104de-579f-48b7-adb6-0a72dc5183b7"
      },
      {
        "category": "external",
        "summary": "Out-of-Band Firmware Update ISO",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/secure-malware-analytics/admin-guide/v2-19/secure-malware-analytics-guide/m_oob-update-firmware.html"
      },
      {
        "category": "external",
        "summary": "patch-common-SNA-FIRMWARE-20260210-M5-REL.iso",
        "url": "https://www.cisco.com/c/dam/en/us/td/docs/security/stealthwatch/cimc_bios/7_5_3_M5_CIMC_firmware_4_3_2_260007_readme_DV_1_0.pdf"
      },
      {
        "category": "external",
        "summary": "patch-common-SNA-FIRMWARE-20260210-M6-REL.iso",
        "url": "https://www.cisco.com/c/dam/en/us/td/docs/security/stealthwatch/cimc_bios/7_5_3_M6_CIMC_firmware_6_0_1_250192_readme_DV_1_0.pdf"
      },
      {
        "category": "external",
        "summary": "Cisco Secure Network Server 3600 Series",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/ise/sns3600hig/sns-36xx-firmware-4-x-xx_upgrade_guide.html#Cisco_Concept.dita_3e2c957e-62e6-4b2d-9f76-96ad121f29e1"
      },
      {
        "category": "external",
        "summary": "Cisco Secure Network Server 3700 Series",
        "url": "https://www.cisco.com/c/en/us/td/docs/security/ise/sns3700hig/sns-37xx-firmware-4-x-xx_upgrade_guide.html#r_overview"
      },
      {
        "category": "external",
        "summary": "Security Vulnerability Policy",
        "url": "http://www.cisco.com/web/about/security/psirt/security_vulnerability_policy.html"
      },
      {
        "category": "external",
        "summary": "Cisco Support and Downloads",
        "url": "https://www.cisco.com/c/en/us/support/index.html"
      },
      {
        "category": "external",
        "summary": "Cisco Technical Assistance Center (TAC)",
        "url": "https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html"
      },
      {
        "category": "external",
        "summary": "the advisories",
        "url": "https://www.cisco.com/go/psirt"
      }
    ],
    "title": "Cisco Integrated Management Controller Authentication Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2026-04-01T16:00:00+00:00",
      "generator": {
        "date": "2026-04-01T15:52:05+00:00",
        "engine": {
          "name": "TVCE"
        }
      },
      "id": "cisco-sa-cimc-auth-bypass-AgG2BxTn",
      "initial_release_date": "2026-04-01T16:00:00+00:00",
      "revision_history": [
        {
          "date": "2026-04-01T15:51:50+00:00",
          "number": "1.0.0",
          "summary": "Initial public release."
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_family",
            "name": "Cisco Unified Computing System (Standalone)",
            "product": {
              "name": "Cisco Unified Computing System (Standalone) ",
              "product_id": "CSAFPID-191638"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Unified Computing System E-Series Software (UCSE)",
            "product": {
              "name": "Cisco Unified Computing System E-Series Software (UCSE) ",
              "product_id": "CSAFPID-201970"
            }
          },
          {
            "category": "product_family",
            "name": "Cisco Enterprise NFV Infrastructure Software",
            "product": {
              "name": "Cisco Enterprise NFV Infrastructure Software ",
              "product_id": "CSAFPID-235874"
            }
          }
        ],
        "category": "vendor",
        "name": "Cisco"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-20093",
      "ids": [
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwq68912"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwq55648"
        },
        {
          "system_name": "Cisco Bug ID",
          "text": "CSCwq55659"
        }
      ],
      "notes": [
        {
          "category": "other",
          "text": "Complete.",
          "title": "Affected Product Comprehensiveness"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-201970",
          "CSAFPID-191638",
          "CSAFPID-235874"
        ]
      },
      "release_date": "2026-04-01T16:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Cisco has released software updates that address this vulnerability.",
          "product_ids": [
            "CSAFPID-235874",
            "CSAFPID-191638",
            "CSAFPID-201970"
          ],
          "url": "https://software.cisco.com"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-201970",
            "CSAFPID-191638",
            "CSAFPID-235874"
          ]
        }
      ],
      "title": "Cisco Integrated Management Controller Authentication Bypass Vulnerability"
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.