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CVE-2015-5400
Squid before 3.5.6 does not properly handle CONNECT method peer responses when configured with cache_peer, which allows remote attackers…
- 6.8MediumCVSS base score
- 20.8%Exploitation in 30 daysEPSS · top 2.4% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Squid before 3.5.6 does not properly handle CONNECT method peer responses when configured with cache_peer, which allows remote attackers to bypass intended restrictions and gain access to a backend proxy via a CONNECT request.
Timeline
ID reserved
By mitre
- 3 months later
· 3 months later
Published
- 9 years later
· 9 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 | Medium6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 20.8% · top 2.4% of all CVEs (10 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.8.
Affected products
n/a
- affected n/a
References
15
- [oss-security] 20150706 Squid HTTP proxy CVE request (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 1032873 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- FEDORA-2016-7b40eb9e29 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.patch (opens in a new tab)x_refsource_CONFIRMx_transferred
- SUSE-SU-2016:1996 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- [oss-security] 20150717 Re: Re: Squid HTTP proxy CVE request (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [oss-security] 20150709 Re: Squid HTTP proxy CVE request (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- openSUSE-SU-2016:2081 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- http://www.squid-cache.org/Versions/v3/3.1/changesets/squid-3.1-10494.patch (opens in a new tab)x_refsource_CONFIRMx_transferred
- [oss-security] 20150710 Re: Squid HTTP proxy CVE request (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- SUSE-SU-2016:2089 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- http://www.squid-cache.org/Advisories/SQUID-2015_2.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-3327 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 75553 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- http://www.squid-cache.org/Versions/v3/3.4/changesets/squid-3.4-13225.patch (opens in a new tab)x_refsource_CONFIRMx_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)
- EUVD EUVD-2015-5356 (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-2015-5400)Record last updated .