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CVE-2026-121292VulnerabilityPublished

A malformed Error Report can cause EOS to read beyond packet boundaries, potentially terminating the RPKI agent or

Source GCVE Database

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Authoritative record:CVE-2026-121292· High 8.2

Not known to be exploited · CVSS 8.2 High : upgrade to 4.33.0F soon.

Data as of 10 Nov 2026, 23:17 UTC

CVSS 3.1 base score
8.2High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Arista)CVSS 3.18.2
CNA (Arista)CVSS 4.08.3
Patch
Available – fixed in 4.33.0F
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade EOS to 4.33.0F.

Affected software

ProductAffectedFixed in
Arista NetworksEOSAffected
  • >=4.36.0F <=4.36.2F
  • >=4.35.0F <=4.35.6M
  • >=4.34.0F <=4.34.8M
  • >=4.33.0F <=4.33.10M
  • >=4.24.0F <4.33.0F
  • =4.37.0F
Fixed in
  • 4.33.0F

Description

A vulnerability in EOS allows a malformed Error Report to cause the system to read beyond packet boundaries. This can lead to termination of the RPKI agent or unintended exposure of memory contents via logging. The flaw is identified as CWE-125 (Out-of-bounds Read) and has a high severity with a CVSS score of 8.2.

References

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