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CVE-2011-4597
The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses…
Medium5.0EPSS 3.2%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
The SIP over UDP implementation in Asterisk Open Source 1.4.x before 1.4.43, 1.6.x before 1.6.2.21, and 1.8.x before 1.8.7.2 uses different port numbers for responses to invalid requests depending on whether a SIP username exists, which allows remote attackers to enumerate usernames via a series of requests.
Timeline
ID reserved
By redhat
- 16 days later
· 16 days later
Published
- 13 years later
· 13 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
- EPSS (exploitation in 30 days)
- 3.2% · top 12% of all CVEs (9 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Weakness
Affected products
n/a
- affected n/a
References (8)
- 77597 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- http://downloads.asterisk.org/pub/security/AST-2011-013.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- [oss-security] 20111209 Re: CVE Request -- Asterisk -- AST-2011-013 and AST-2011-014 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [oss-security] 20111209 CVE Request -- Asterisk -- AST-2011-013 and AST-2011-014 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 47273 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 20111222 Exploit for Asterisk Security Advisory AST-2011-013 (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- DSA-2367 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- [asterisk-dev] 20111108 Summary: SIP, NAT, security concerns, oh my! (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2011-4597)Record last updated .