CVE-2026-20084 (GCVE-0-2026-20084)
Vulnerability from cvelistv5 – Published: 2026-03-25 16:02 – Updated: 2026-03-26 17:35
VLAI?
Summary
A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition.
This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition.
Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.
There are workarounds that address this vulnerability.
Severity ?
8.6 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cisco | Cisco IOS XE Software |
Affected:
16.6.1
Affected: 16.6.2 Affected: 16.6.3 Affected: 16.6.4 Affected: 16.6.5 Affected: 16.6.4a Affected: 16.6.6 Affected: 16.6.7 Affected: 16.6.8 Affected: 16.6.9 Affected: 16.6.10 Affected: 16.7.1 Affected: 16.8.1 Affected: 16.8.1a Affected: 16.8.1s Affected: 16.9.1 Affected: 16.9.2 Affected: 16.9.1s Affected: 16.9.3 Affected: 16.9.4 Affected: 16.9.5 Affected: 16.9.6 Affected: 16.9.7 Affected: 16.9.8 Affected: 16.10.1 Affected: 16.10.1s Affected: 16.10.1e Affected: 16.11.1 Affected: 16.11.1b Affected: 16.11.1s Affected: 16.12.1 Affected: 16.12.1s Affected: 16.12.1c Affected: 16.12.2 Affected: 16.12.3 Affected: 16.12.8 Affected: 16.12.2s Affected: 16.12.4 Affected: 16.12.3s Affected: 16.12.3a Affected: 16.12.4a Affected: 16.12.5 Affected: 16.12.6 Affected: 16.12.5b Affected: 16.12.6a Affected: 16.12.7 Affected: 17.1.1 Affected: 17.1.1s Affected: 17.1.1t Affected: 17.1.3 Affected: 17.2.1 Affected: 17.2.1a Affected: 17.3.1 Affected: 17.3.2 Affected: 17.3.3 Affected: 17.3.2a Affected: 17.3.4 Affected: 17.3.5 Affected: 17.3.6 Affected: 17.3.7 Affected: 17.3.8 Affected: 17.3.8a Affected: 17.4.1 Affected: 17.5.1 Affected: 17.6.1 Affected: 17.6.2 Affected: 17.6.3 Affected: 17.6.1y Affected: 17.6.4 Affected: 17.6.5 Affected: 17.6.6 Affected: 17.6.6a Affected: 17.6.5a Affected: 17.6.7 Affected: 17.6.8 Affected: 17.7.1 Affected: 17.10.1 Affected: 17.10.1b Affected: 17.8.1 Affected: 17.9.1 Affected: 17.9.2 Affected: 17.9.3 Affected: 17.9.4 Affected: 17.9.5 Affected: 17.9.4a Affected: 17.9.6 Affected: 17.9.6a Affected: 17.9.7 Affected: 17.9.8 Affected: 17.11.1 Affected: 17.12.1 Affected: 17.12.2 Affected: 17.12.3 Affected: 17.12.4 Affected: 17.12.5 Affected: 17.12.1z5 Affected: 17.13.1 Affected: 17.14.1 Affected: 17.15.1 Affected: 17.15.2 Affected: 17.15.3 Affected: 17.15.2b Affected: 17.15.4 Affected: 17.15.4d Affected: 17.16.1 Affected: 17.17.1 Affected: 17.18.1 |
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\"version\": \"17.6.6\"}, {\"status\": \"affected\", \"version\": \"17.6.6a\"}, {\"status\": \"affected\", \"version\": \"17.6.5a\"}, {\"status\": \"affected\", \"version\": \"17.6.7\"}, {\"status\": \"affected\", \"version\": \"17.6.8\"}, {\"status\": \"affected\", \"version\": \"17.7.1\"}, {\"status\": \"affected\", \"version\": \"17.10.1\"}, {\"status\": \"affected\", \"version\": \"17.10.1b\"}, {\"status\": \"affected\", \"version\": \"17.8.1\"}, {\"status\": \"affected\", \"version\": \"17.9.1\"}, {\"status\": \"affected\", \"version\": \"17.9.2\"}, {\"status\": \"affected\", \"version\": \"17.9.3\"}, {\"status\": \"affected\", \"version\": \"17.9.4\"}, {\"status\": \"affected\", \"version\": \"17.9.5\"}, {\"status\": \"affected\", \"version\": \"17.9.4a\"}, {\"status\": \"affected\", \"version\": \"17.9.6\"}, {\"status\": \"affected\", \"version\": \"17.9.6a\"}, {\"status\": \"affected\", \"version\": \"17.9.7\"}, {\"status\": \"affected\", \"version\": \"17.9.8\"}, {\"status\": \"affected\", \"version\": \"17.11.1\"}, {\"status\": \"affected\", \"version\": \"17.12.1\"}, {\"status\": \"affected\", \"version\": \"17.12.2\"}, {\"status\": \"affected\", \"version\": \"17.12.3\"}, {\"status\": \"affected\", \"version\": \"17.12.4\"}, {\"status\": \"affected\", \"version\": \"17.12.5\"}, {\"status\": \"affected\", \"version\": \"17.12.1z5\"}, {\"status\": \"affected\", \"version\": \"17.13.1\"}, {\"status\": \"affected\", \"version\": \"17.14.1\"}, {\"status\": \"affected\", \"version\": \"17.15.1\"}, {\"status\": \"affected\", \"version\": \"17.15.2\"}, {\"status\": \"affected\", \"version\": \"17.15.3\"}, {\"status\": \"affected\", \"version\": \"17.15.2b\"}, {\"status\": \"affected\", \"version\": \"17.15.4\"}, {\"status\": \"affected\", \"version\": \"17.15.4d\"}, {\"status\": \"affected\", \"version\": \"17.16.1\"}, {\"status\": \"affected\", \"version\": \"17.17.1\"}, {\"status\": \"affected\", \"version\": \"17.18.1\"}]}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA\", \"name\": \"cisco-sa-bootp-WuBhNBxA\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \\r\\n\\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \\r\\n\\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\\r\\n\\r There are workarounds that address this vulnerability.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-400\", \"description\": \"Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-25T16:02:39.119Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-20084\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-26T17:35:50.008Z\", \"dateReserved\": \"2025-10-08T11:59:15.366Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-03-25T16:02:39.119Z\", \"assignerShortName\": \"cisco\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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