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Fencer Vulns
critical 9.9

CVE-2020-15049 json

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3.

published 2020-06-30 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7177

cvss
9.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.3%
EPSS 5.3% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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.

Patch / fix

  • squid-cache squid 4.12, 5.0.3
  • squid Debian 14, Debian 13, Debian 12 4.12-1

debian advisories DEBIAN-CVE-2020-15049

  • squid Ubuntu 20.04 LTS 4.10-1ubuntu1.3
  • squid3 Ubuntu 16.04 LTS 3.5.12-1ubuntu7.15
  • squid3 Ubuntu 18.04 LTS 3.5.27-1ubuntu1.9

ubuntu advisories UBUNTU-CVE-2020-15049

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • squid RHEL 7 7:3.5.20-17.el7_9.4
  • squid-sysvinit RHEL 7 7:3.5.20-17.el7_9.4
  • squid-migration-script RHEL 7 7:3.5.20-17.el7_9.4
  • squid RHEL 8 7:4.11-3.module+el8.3.0+7851+7808b5f9
  • libecap RHEL 8 1.0.1-2.module+el8.1.0+4044+36416a77

red hat advisories RHSA-2020:4082RHSA-2020:4743

  • squid SLES for SAP 12 SP5, SLES 12 SP5 4.13-4.15.1
  • squid SLES for SAP 15, SLES 15-LTSS, SLE Module for Server Applications 15 SP2 +3 more 4.13-5.23.1
  • squid3 SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 3.1.23-8.16.37.12.1
  • squid SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +12 more 3.5.21-26.29.1

suse advisories SUSE-SU-2020:2443-1SUSE-SU-2020:2442-1SUSE-SU-2020:14460-1SUSE-SU-2020:1946-1

  • squid openSUSE Tumbleweed 4.16-1.5
  • squid openSUSE Leap 15.2 4.13-lp152.2.6.1
  • squid openSUSE Leap 15.1 4.13-lp151.2.24.1

opensuse advisories openSUSE-SU-2024:11403-1openSUSE-SU-2020:1369-1openSUSE-SU-2020:1346-1

  • libecap AlmaLinux 8 1.0.1-2.module_el8.6.0+2741+01592ae8

almalinux advisories ALSA-2020:4743

  • libecap Rocky Linux 8 1.0.1-2.module+el8.4.0+404+316a0dc5

rocky linux advisories RLSA-2020:4743

  • squid Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 4.12.0-r0

alpine advisories ALPINE-CVE-2020-15049

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-15049 updated cvss 8.5

squid: Request smuggling and poisoning attack against the HTTP cache

  • Red Hat Enterprise Linux 5 squid Red Hat Enterprise Linux 6 squid, squid34
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) squid 4.11-3.module+el8.3.0+7851+7808b5f9, libecap 1.0.1-2.module+el8.1.0+4044+36416a77
    fixed: vendor fix RHSA-2020:4743
  • Red Hat Enterprise Linux Server (v. 7) squid 3.5.20-17.el7_9.4, squid-sysvinit 3.5.20-17.el7_9.4, squid-migration-script 3.5.20-17.el7_9.4 Red Hat Enterprise Linux Server Optional (v. 7) squid 3.5.20-17.el7_9.4, squid-sysvinit 3.5.20-17.el7_9.4, squid-migration-script 3.5.20-17.el7_9.4 Red Hat Enterprise Linux Workstation (v. 7) squid 3.5.20-17.el7_9.4, squid-sysvinit 3.5.20-17.el7_9.4, squid-migration-script 3.5.20-17.el7_9.4 Red Hat Enterprise Linux Workstation Optional (v. 7) squid 3.5.20-17.el7_9.4, squid-sysvinit 3.5.20-17.el7_9.4, squid-migration-script 3.5.20-17.el7_9.4
    fixed: vendor fix RHSA-2020:4082

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

5.34% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.9 CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:C/UI:N
CNA 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.