CVE-2026-20341

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-16. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software could allow an authenticated, remote attacker to obtain root privileges. This vulnerability is due to unsecured deserialization of untrusted data over the sftunnel management connection. An attacker could exploit this vulnerability by sending crafted sftunnel remote procedure calls (RPCs). A successful exploit could allow the attacker to gain root privileges on a device that is running Cisco Secure FMC Software and its high-availability peer. To exploit this vulnerability, the attacker must have valid administrative credentials on a managed Cisco FTD device.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 18, 2026

Advisory Details (1)

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

Cisco Secure Firewall Management Center Software Vulnerabilities

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-mulivulns-4PsnFwvx

Vendor Advisories for CVE-2026-20341(2)

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 28× in last 7d / 28× 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. 2026-09-19 10:53 UTCGHSA enrichment
  2. 2026-09-19 07:07 UTCGHSA enrichment
  3. 2026-09-19 03:20 UTCGHSA enrichment
  4. 2026-09-18 23:33 UTCGHSA enrichment
  5. 2026-09-18 19:47 UTCEG score recompute
  6. 2026-09-18 19:47 UTCGHSA enrichment
  7. 2026-09-18 19:27 UTCEPSS rescore
  8. 2026-09-18 16:00 UTCGHSA enrichment
  9. 2026-09-18 12:07 UTCGHSA enrichment
  10. 2026-09-18 08:21 UTCGHSA enrichment
  11. 2026-09-18 04:34 UTCEG score recompute
  12. 2026-09-18 04:34 UTCGHSA enrichment
  13. 2026-09-18 04:04 UTCEG score recompute
  14. 2026-09-18 04:04 UTCGHSA enrichment
  15. 2026-09-18 01:32 UTCGHSA enrichment
  16. 2026-09-17 21:46 UTCEG score recompute
  17. 2026-09-17 21:46 UTCGHSA enrichment
  18. 2026-09-17 17:59 UTCEG score recompute
  19. 2026-09-17 17:59 UTCGHSA enrichment
  20. 2026-09-17 15:50 UTCGHSA enrichment
  21. 2026-09-17 12:03 UTCGHSA enrichment
  22. 2026-09-17 08:17 UTCGHSA enrichment
  23. 2026-09-17 04:31 UTCGHSA enrichment
  24. 2026-09-17 00:45 UTCEG score recompute
  25. 2026-09-17 00:45 UTCGHSA enrichment
Show 3 more
  1. 2026-09-16 20:30 UTCEG score recompute
  2. 2026-09-16 20:09 UTCEG score recompute
  3. 2026-09-16 20:09 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-20341?
CVE-2026-20341 is a critical vulnerability published on September 16, 2026. A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software could allow an authenticated, remote attacker to obtain root privileges. This vulnerability is due to unsecured deserialization of untrusted data over the sftunnel management connection. An…
When was CVE-2026-20341 disclosed?
CVE-2026-20341 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20341 actively exploited?
CVE-2026-20341 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.9% of all scored CVEs.
What is the CVSS score of CVE-2026-20341?
CVE-2026-20341 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-20341?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20341, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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