NCSC-2026-0279

Vulnerability from csaf_ncscnl - Published: 2026-08-07 08:29 - Updated: 2026-08-07 08:29
Summary
Kwetsbaarheden verholpen in Cisco IOS XE Software
Notes
The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten: Cisco heeft meerdere kwetsbaarheden verholpen in Cisco IOS XE Software.
Interpretaties: De kwetsbaarheden zijn intern ontdekt tijdens een uitgebreide beveiligingsreview van Cisco IOS XE Software. De geïdentificeerde problemen betreffen onder andere onjuiste toegangscontrole, onjuiste restricties bij geheugenbufferoperaties, onjuiste resourcecontrole, onjuiste berekeningen, onvoldoende control flow management, onjuiste neutralisatie van speciale elementen en onjuiste inputvalidatie. De kwetsbaarheden kunnen door een aanvaller worden misbruikt via de genoemde zwakheden in toegang, geheugenbeheer, resourcebeheer, berekeningen, control flow, neutralisatie van speciale elementen en inputvalidatie. De kwetsbaarheden zijn specifiek voor Cisco IOS XE Software.
Oplossingen: Cisco heeft software updates uitgebracht voor Cisco IOS XE Software om deze intern ontdekte kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans: medium
Schade: high
CWE-20: Improper Input Validation
CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-284: Improper Access Control
CWE-664: Improper Control of a Resource Through its Lifetime
CWE-682: Incorrect Calculation
CWE-691: Insufficient Control Flow Management
CVE-2026-20267

Cisco's IOS XE Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper access control issues identified as CVE-2026-20267 under CWE-284.

9.0 (Critical)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco IOS XE Software
 vers:unknown/*
CVE-2026-20268

Cisco's IOS XE Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including CVE-2026-20268 related to improper memory buffer operation restrictions.

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco IOS XE Software
 vers:unknown/*
CVE-2026-20269

Cisco's IOS XE Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper resource control issues tracked under CVE-2026-20269 and CWE-664.

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco IOS XE Software
 vers:unknown/*
CVE-2026-20270

Cisco's IOS XE Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including incorrect calculation issues classified under CWE-682 and tracked by CVE-2026-20270.

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco IOS XE Software
 vers:unknown/*
CVE-2026-20271

Cisco's IOS XE Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities related to insufficient control flow management, including CVE-2026-20271 (CWE-691).

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco IOS XE Software
 vers:unknown/*
CVE-2026-20272

Cisco's IOS XE Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper neutralization of special elements (CWE-74) tracked by CVE-2026-20272.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco IOS XE Software
 vers:unknown/*
CVE-2026-20273

Cisco's IOS XE Software team conducted an internal security review resulting in software hardening releases that address multiple vulnerabilities, including improper input validation issues such as CVE-2026-20273 (CWE-20).

8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
vers:unknown/*
Cisco / Cisco IOS XE Software
 vers:unknown/*
References
To clipboard 

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      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
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        "text": "Cisco heeft meerdere kwetsbaarheden verholpen in Cisco IOS XE Software.",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De kwetsbaarheden zijn intern ontdekt tijdens een uitgebreide beveiligingsreview van Cisco IOS XE Software. De ge\u00efdentificeerde problemen betreffen onder andere onjuiste toegangscontrole, onjuiste restricties bij geheugenbufferoperaties, onjuiste resourcecontrole, onjuiste berekeningen, onvoldoende control flow management, onjuiste neutralisatie van speciale elementen en onjuiste inputvalidatie. De kwetsbaarheden kunnen door een aanvaller worden misbruikt via de genoemde zwakheden in toegang, geheugenbeheer, resourcebeheer, berekeningen, control flow, neutralisatie van speciale elementen en inputvalidatie. De kwetsbaarheden zijn specifiek voor Cisco IOS XE Software.",
        "title": "Interpretaties"
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}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.