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Vulnerability record · CVE-2020-15049 · published 30 June 2020

CVE-2020-15049: Squid-cache squid http request smuggling vulnerability

Squid Cache · Squid

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

8.8 CVSS 3.1 High EPSS 5.7% · top 7.2% CWE-444 · HTTP request smuggling
8.8CVSS 3.1 base score, v2 6.5
5.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
20References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html
http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad0094647ea57a6eb8d.patch PatchVendor Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ
https://security.netapp.com/advisory/ntap-20210312-0001/
https://usn.ubuntu.com/4551-1/
https://www.debian.org/security/2020/dsa-4732
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html
http://www.squid-cache.org/Versions/v4/changesets/squid-4-ea12a34d338b962707d5078d6d1fc7c6eb119a22.patch PatchVendor Advisory
http://www.squid-cache.org/Versions/v5/changesets/squid-5-485c9a7bb1bba88754e07ad0094647ea57a6eb8d.patch PatchVendor Advisory
https://github.com/squid-cache/squid/security/advisories/GHSA-qf3v-rc95-96j5 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3RG5FGSTCAYVIJPJHIY3MRZ
https://security.netapp.com/advisory/ntap-20210312-0001/
https://usn.ubuntu.com/4551-1/
https://www.debian.org/security/2020/dsa-4732

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Source: NIST National Vulnerability Database (record CVE-2020-15049), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.