Cisco Adaptive Security Appliances (ASA) 5580 series devices with software before 8.1(2) allow remote attackers to cause a denial of servic…

published 2010-06-29 16y ago modified 2026-06-16 4mo ago also EUVD-2009-4881

cvss: 7.8; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.4%; EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits: 0; none known

Cisco Adaptive Security Appliances (ASA) 5580 series devices with software before 8.1(2) allow remote attackers to cause a denial of service (IKE process hang) via malformed NAT-T packets, aka Bug ID CSCsr74439.

Patch / fix

links 1

cisco.com/en/US/docs/security/asa/asa81/release/notes/asarn812.html patch

Is CVE-2009-4918 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness

CWE-20 Improper Input Validation

References

cisco.com /en/US/docs/security/asa/asa81/release/notes/asarn812.html
patch

Sources

CVE List CVE-2009-4918
NVD CVE-2009-4918

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.