CVE-2011-2529
CVE-2011-2529 is a medium-severity vulnerability in Digium Asterisk with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.
Key facts
- Severity: Medium (CVSS 2.0 base score 5.0)
- EPSS exploit prediction: 4% (90th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: Digium Asterisk
- Published:
- Last modified:
Description
chan_sip.c in the SIP channel driver in Asterisk Open Source 1.6.x before 1.6.2.18.1 and 1.8.x before 1.8.4.3 does not properly handle '\0' characters in SIP packets, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted packet.
Frequently asked questions
- What is CVE-2011-2529?
- chan_sip.c in the SIP channel driver in Asterisk Open Source 1.6.x before 1.6.2.18.1 and 1.8.x before 1.8.4.3 does not properly handle '\0' characters in SIP packets, which allows remote attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a crafted packet.
- How severe is CVE-2011-2529?
- CVE-2011-2529 has a CVSS 2.0 base score of 5.0, rated medium severity.
- Is CVE-2011-2529 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2011-2529?
- CVE-2011-2529 primarily affects Digium Asterisk. In total, 162 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2011-2529?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2011-2529 published?
- CVE-2011-2529 was published on 2011-07-06 and last updated on 2026-06-16.
References
- http://downloads.asterisk.org/pub/security/AST-2011-008.diff
- http://downloads.asterisk.org/pub/security/AST-2011-008.html
- http://lists.fedoraproject.org/pipermail/package-announce/2011-July/062628.html
- http://secunia.com/advisories/45048
- http://secunia.com/advisories/45201
- http://secunia.com/advisories/45239
- http://securitytracker.com/id?1025706
- http://www.debian.org/security/2011/dsa-2276
- http://www.osvdb.org/73307
- http://www.securityfocus.com/bid/48431
- https://exchange.xforce.ibmcloud.com/vulnerabilities/68203
Affected products (162)
- cpe:2.3:a:digium:asterisk:1.6.0:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta1:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta2:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta3:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta4:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta5:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta6:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta7:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta7.1:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta8:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:beta9:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:rc4:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:rc5:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0:rc6:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.3:rc1:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.4:rc1:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.5:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.6:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.7:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.8:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.9:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.10:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.11:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.11:rc1:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.11:rc2:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.12:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.13:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.14:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.14:rc1:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.15:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.16:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.16:rc1:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.16:rc2:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.17:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.18:*:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.18:rc1:*:*:*:*:*:*
- cpe:2.3:a:digium:asterisk:1.6.0.18:rc2:*:*:*:*:*:*
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