Affects widely deployed network OS; could disrupt VPN/IPsec services across many enterprises.
CVE-2025-8873
Arista EOS IPsec dataplane halt via crafted packet
Is CVE-2025-8873 being exploited?
Not confirmed. CVE-2025-8873 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 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2025-8873?
CVE-2025-8873 is rated High with a CVSS score of 8.7. 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-2025-8873?
Yes. A fix has been recorded for CVE-2025-8873. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-8873 affect?
CVE-2025-8873 affects Arista EOS with IPsec configured. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-8873?
Plan upgrade to fixed EOS version; monitor IPsec traffic
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted IPsec packet stalls dataplane; VPN/IPsec traffic blocked until reset; non-IPsec traffic unaffected.
Patch when possible
- affected>= 4.33.0M and <= 4.33.4M
- affected>= 4.32.0M and <= 4.32.6.1M
- affected>= 4.31.0M and <= 4.31.7.1M
- affected>= 4.30.0M and <= 4.30.10M
- affected>= 4.29.0M and <= 4.29.10.1M
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.