CVE-2026-2379
IPsec VPN tunnels unstable on Arista EOS after interface flaps/restarts.
Is CVE-2026-2379 being exploited?
Not confirmed. CVE-2026-2379 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-2379?
CVE-2026-2379 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-2379?
Yes. A fix has been recorded for CVE-2026-2379. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-2379 affect?
CVE-2026-2379 affects Arista EOS with hardware IPSec support (IPsec features enabled). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-2379?
Apply EOS firmware update when released; monitor VPN status
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
VPN tunnels may re-establish with SA sequence-number mismatches, causing disruption of secure communications.
Patch when possible
- affected>= 4.34.0 and <= 4.34.3M
- affected>= 4.33.0M and <= 4.33.5M
- affected>= 4.32.0M and <= 4.32.7M
- affected>= 4.31.0M and <= 4.31.9M
- affected>= 4.30.0F and < 4.31.0
- affected>= 4.29.0F and < 4.30.0
- affected>= 4.28.0F and < 4.29.0
- affected>= 4.27.1F and < 4.28.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.