CVE-2026-77190

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-16. A secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent to terminate unexpectedly. The Pimsm agent is automatically restarted, but repeated attacks can cause the agent to restart continuously, resulting in a sustained denial of service.

CVSS v3
6.5
EG Score
6.5MEDIUMhigh confidence
EG Risk
29
EG Risk 29/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
18th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 16, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Security Advisory 0177 - Arista

https://www.arista.com/en/support/advisories-notices/security-advisory/24733-security-advisory-0177

Vendor Advisories for CVE-2026-77190(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 56× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 11:36 UTCEG score recompute
  3. 2026-10-04 11:36 UTCGHSA enrichment
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-03 10:39 UTCEG score recompute
  6. 2026-10-03 10:39 UTCGHSA enrichment
  7. 2026-10-02 09:39 UTCEG score recompute
  8. 2026-10-02 09:39 UTCGHSA enrichment
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-10-01 08:43 UTCEG score recompute
  11. 2026-10-01 08:43 UTCGHSA enrichment
  12. 2026-09-30 07:48 UTCEG score recompute
  13. 2026-09-30 07:48 UTCGHSA enrichment
  14. 2026-09-29 15:24 UTCEPSS rescore
  15. 2026-09-29 06:51 UTCEG score recompute
  16. 2026-09-29 06:51 UTCGHSA enrichment
  17. 2026-09-28 13:52 UTCEPSS rescore
  18. 2026-09-28 05:56 UTCEG score recompute
  19. 2026-09-28 05:56 UTCGHSA enrichment
  20. 2026-09-27 13:48 UTCEPSS rescore
  21. 2026-09-27 05:00 UTCEG score recompute
  22. 2026-09-27 05:00 UTCGHSA enrichment
  23. 2026-09-26 15:59 UTCEPSS rescore
  24. 2026-09-26 04:04 UTCEG score recompute
  25. 2026-09-26 04:03 UTCGHSA enrichment
Show 31 more
  1. 2026-09-26 00:28 UTCEPSS rescore
  2. 2026-09-25 02:58 UTCEG score recompute
  3. 2026-09-25 02:58 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 02:00 UTCEG score recompute
  6. 2026-09-24 02:00 UTCGHSA enrichment
  7. 2026-09-23 17:54 UTCEPSS rescore
  8. 2026-09-23 01:04 UTCEG score recompute
  9. 2026-09-23 01:04 UTCGHSA enrichment
  10. 2026-09-22 16:01 UTCEPSS rescore
  11. 2026-09-22 00:08 UTCEG score recompute
  12. 2026-09-22 00:08 UTCGHSA enrichment
  13. 2026-09-21 21:09 UTCEPSS rescore
  14. 2026-09-20 23:11 UTCEG score recompute
  15. 2026-09-20 23:11 UTCGHSA enrichment
  16. 2026-09-20 20:16 UTCEPSS rescore
  17. 2026-09-19 22:10 UTCEG score recompute
  18. 2026-09-19 22:10 UTCGHSA enrichment
  19. 2026-09-18 21:14 UTCEG score recompute
  20. 2026-09-18 21:14 UTCGHSA enrichment
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-17 20:12 UTCEG score recompute
  23. 2026-09-17 20:12 UTCGHSA enrichment
  24. 2026-09-16 19:11 UTCGHSA enrichment
  25. 2026-09-16 14:24 UTCEG score recompute
  26. 2026-09-16 14:24 UTCGHSA enrichment
  27. 2026-09-16 13:41 UTCEG score recompute
  28. 2026-09-16 13:40 UTCGHSA enrichment
  29. 2026-09-16 10:25 UTCEG score recompute
  30. 2026-09-16 10:12 UTCEG score recompute
  31. 2026-09-16 10:11 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77190?
CVE-2026-77190 is a medium vulnerability published on September 16, 2026. On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent to terminate unexpectedly. The Pimsm agent is automatically…
When was CVE-2026-77190 disclosed?
CVE-2026-77190 was first published on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77190 actively exploited?
CVE-2026-77190 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-77190?
CVE-2026-77190 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-77190?
No fix for CVE-2026-77190 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-77190 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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