CVE-2026-121289
Security Advisory 0208
No exploitation reported by the sources we read.
- Published2026-11-10
- WeaknessCWE-121
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
On affected platforms running Arista EOS with BGP configured, a specially crafted packet can cause the BGP agent to crash. Successful exploitation causes the BGP agent process to terminate, resulting in the loss of all BGP sessions on the affected device and possible disruption to network routing until the process recovers. Due to the nature of the vulnerability, it may also be possible for a sophisticated attacker to achieve arbitrary code execution, which could compromise the confidentiality and integrity of the affected system.
Timeline
dates in UTC- 2026-11-1020:09CVE publishedCNA
Versions per branch
Products declared by the CNA
As Arista, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.
- Arista Networks EOSother versions: not affected
platforms: 710 Series, 720D Series, 720XP/722XPM Series, 750X Series, 7010TX Series, 7020R/R4 Series, 7130 Series running EOS, 7170 Series, 7050X3/X4 Series, 7060X/X2/X4/X5/X6/XE7 Series, 7260X/X3 Series, 7280R/R2/R3/R4 Series, 7300X/X3 Series, 7320X Series, 7358X4 Series, 7368X4 Series, 7388X5 Series, 7500R/R2/R3 Series, 7800R3/R4 Series, 7700R4 Series, AWE 5000 Series, AWE 7200R Series, ZTX-7200 Series, CloudEOS, cEOS-lab, vEOS-lab, CloudVision eXchange, virtual or physical appliance
Affected- ≥ 4.36.0F, ≤ 4.36.2Fno fix statedcustom
- ≥ 4.35.0F, ≤ 4.35.6Mno fix statedcustom
- ≥ 4.34.0F, ≤ 4.34.8Mno fix statedcustom
- ≥ 4.33.0F, ≤ 4.33.10Mno fix statedcustom
- ≥ 4.25.1F, < 4.33.0Ffixed in 4.33.0Fcustom
Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-10
Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-121289 yet.
Fix
No fix published by the sources we read yet. NVD record
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Metasploit modules
- none listed Metasploit Framework
Sources
Identifiers
- EUVD-2026-122810same flawENISA EUVD · LicenseRef-ENISA-legal-notice
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 4.0 vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Published
- 2026-11-10
- Last Modified
- 2026-11-10
- NVD status
- Received
Frequently asked questions
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