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TI-2020-11830 Aliases CVE-2020-15049

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

Priority MEDIUM 51CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 5 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

EPSS 0.05706 93rd percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 5 fixed, 2 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 11

CPEVersionsRoleVendor
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*2.0 – 2.6; 3.1 – 3.5.28; 4.0 to before 4.12; 5.0 to before 5.0.3Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:*:*:*:*:*:*:*2.7Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:stable2:*:*:*:*:*:*2.7 stable2Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:stable3:*:*:*:*:*:*2.7 stable3Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:stable4:*:*:*:*:*:*2.7 stable4Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:stable5:*:*:*:*:*:*2.7 stable5Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:stable6:*:*:*:*:*:*2.7 stable6Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:stable7:*:*:*:*:*:*2.7 stable7Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:stable8:*:*:*:*:*:*2.7 stable8Vulnerablesquid-cache
cpe:2.3:a:squid-cache:squid:2.7:stable9:*:*:*:*:*:*2.7 stable9Vulnerablesquid-cache
  • cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* Versions 2.0 – 2.6; 3.1 – 3.5.28; 4.0 to before 4.12; 5.0 to before 5.0.3 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:*:*:*:*:*:*:* Versions 2.7 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:stable2:*:*:*:*:*:* Versions 2.7 stable2 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:stable3:*:*:*:*:*:* Versions 2.7 stable3 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:stable4:*:*:*:*:*:* Versions 2.7 stable4 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:stable5:*:*:*:*:*:* Versions 2.7 stable5 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:stable6:*:*:*:*:*:* Versions 2.7 stable6 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:stable7:*:*:*:*:*:* Versions 2.7 stable7 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:stable8:*:*:*:*:*:* Versions 2.7 stable8 Vulnerable ·squid-cache
  • cpe:2.3:a:squid-cache:squid:2.7:stable9:*:*:*:*:*:* Versions 2.7 stable9 Vulnerable ·squid-cache
Show 1 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*31VulnerableFedoraproject
  • cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject

Remediation

Red Hat 2 advisories

  • RHSA-2020:4743 Released 2020-11-04 · Red Hat rating Moderate
    squid:4 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) libecap-1.0.1-2.module+el8.1.0+4044+36416a77.aarch64::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.ppc64le::squid:4, libecap-1.0.1-2.module+el8.1.0+4044+36416a77.s390x::squid:4 +11
  • RHSA-2020:4082 Released 2020-09-30 · Red Hat rating Important
    squid security update
    • Red Hat Enterprise Linux Server (v. 7) squid-7:3.5.20-17.el7_9.4, squid-migration-script-7:3.5.20-17.el7_9.4
    • Red Hat Enterprise Linux Server Optional (v. 7) squid-sysvinit-7:3.5.20-17.el7_9.4
    • Red Hat Enterprise Linux Workstation (v. 7) squid-7:3.5.20-17.el7_9.4, squid-migration-script-7:3.5.20-17.el7_9.4
    • Red Hat Enterprise Linux Workstation Optional (v. 7) squid-sysvinit-7:3.5.20-17.el7_9.4

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:4743
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4082
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:4082
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4082
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:4082

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-15049

References

Patch 2

Advisory 6

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences