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CVE-2009-4918

23
FAUCET Score

CVE-2009-4918 describes a denial-of-service vulnerability affecting Cisco ASA 5580 series devices running software versions prior to 8.1(2). This flaw allows unauthenticated remote attackers to cause an IKE process hang by sending malformed NAT-T packets. With a CVSS score of 7.8 (High), this vulnerability is easily exploitable over the network with low attack complexity, leading to a complete loss of availability for the affected device. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 8.1\(1\)CPE matchmatch criteria
cpe:2.3:h:cisco:asa_5580:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.8HIGH

AV:N/AC:L/Au:N/C:N/I:N/A:C

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.39%
Probability of exploitation in next 30 days
EPSS Percentile
69.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0139 is in the 50th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

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