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CVE-2009-2651

19
FAUCET Score

CVE-2009-2651 describes a denial-of-service vulnerability in Asterisk Open Source versions prior to 1.6.1.2, specifically affecting the main/rtp.c component. An unauthenticated remote attacker can crash the system by sending a malformed RTP text frame, leading to a NULL pointer dereference. This vulnerability has a CVSS score of 5.0, indicating a medium severity with low attack complexity and no impact on confidentiality or integrity, but a high impact on availability. There is no known public exploit code, active exploitation, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.6.1CPE matchmatch criteria
cpe:2.3:a:digium:asterisk:1.6.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.27%
Probability of exploitation in next 30 days
EPSS Percentile
81.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0227 is in the 71st percentile among its peer group of 23,723 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Advisories (1)

redhatCVE-2009-2651Important

asterisk: remote DoS on receipt of malformed RTP text frames

Jul 27, 2009

References

downloads.asterisk.org / pub/security/AST-2009-004.html
Vendor Advisory
downloads.digium.com / pub/security/AST-2009-004-1.6.1.diff.txt
Exploit
osvdb.org / 56571
secunia.com / advisories/36039
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/52046
securityfocus.com / bid/35837
securitytracker.com / id
vupen.com / english/advisories/2009/2067
PatchVendor Advisory