CVE-2011-2665
Status: ModifiedMedium (5)—
reqresp_parser.c in the SIP channel driver in Asterisk Open Source 1.8.x before 1.8.4.3 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a SIP packet with a Contact header that lacks a < (less than) character.
CVSS
- Version: 2.0
- Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
- Base score: 5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 3.97%
- Percentile among all scored CVEs: 90
- Score date: 10/7/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
CWEs
- NVD-CWE-Other
References
- http://downloads.asterisk.org/pub/security/AST-2011-009-1.8.diff
- http://downloads.asterisk.org/pub/security/AST-2011-009.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://www.debian.org/security/2011/dsa-2276
- http://downloads.asterisk.org/pub/security/AST-2011-009-1.8.diff
- http://downloads.asterisk.org/pub/security/AST-2011-009.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://www.debian.org/security/2011/dsa-2276
Raw JSON (NVD)
Show
{
"id": "CVE-2011-2665",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
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"accessVector": "NETWORK",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"authentication": "NONE",
"integrityImpact": "NONE",
"accessComplexity": "LOW",
"availabilityImpact": "PARTIAL",
"confidentialityImpact": "NONE"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 10,
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"userInteractionRequired": false
}
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"affected": [
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],
"published": "2011-07-06T19:55:03.590",
"references": [
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"weaknesses": [
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"descriptions": [
{
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},
{
"lang": "es",
"value": "reqresp_parser.c en el controlador de canal SIP en Asterisk Open Source v1.8.x anteriores a v1.8.4.3 permite a atacantes remotos provocar una denegación de servicio (desreferencia a puntero NULL y caída del demonio) a través de un paquete SIP con una cabecera Contact que carece de un carácter < (menos que)."
}
],
"lastModified": "2026-06-16T23:31:45.360",
"configurations": [
{
"nodes": [
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"evaluatorComment": "Per: http://cwe.mitre.org/data/definitions/476.html\r\n'CWE-476: NULL Pointer Dereference'",
"sourceIdentifier": "cve@mitre.org"
}