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No exploitation reportedFix available

CVE-2020-8449

No exploitation reported by the sources we read.

  • Published2020-02-04
  • WeaknessCWE-668

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.

Timeline

dates in UTC
  1. 2020-02-0420:15CVE publishedNVD

Versions per branch

NVD
Canonical ubuntu linux
BranchAffectedFixed in
16.4= 16.04no fix published
18.4= 18.04no fix published
19.10= 19.10no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published
10.0= 10.0no fix published
Fedoraproject fedora
BranchAffectedFixed in
30.x= 30no fix published
31.x= 31no fix published

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • libecapRocky Linux:8all versions · fixed in 0:1.0.1-2.module+el8.4.0+404+316a0dc5
  • libecapRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:1.0.1-2.module+el8.1.0+4044+36416a77and 3 other packages
  • libecapAlmaLinux:8all versions · fixed in 1.0.1-2.module_el8.6.0+2741+01592ae8and 1 other package
  • squidUbuntu:20.04:LTSall versions · fixed in 4.9-2ubuntu4
  • squidTuxCare:OracleLinux:6all versions · fixed in 7:3.1.23-29.el6.cloudlinux.els
  • squidTuxCare:CentOS:6all versions · fixed in 7:3.1.23-29.el6.cloudlinux.els
  • squidSUSE:OpenStack Cloud Crowbar 8all versions · fixed in 3.5.21-26.20.1
  • squidSUSE:OpenStack Cloud 8all versions · fixed in 3.5.21-26.20.1

50 more package ranges on OSV.dev

Vendor advisories

  • RHSA-2020:4743 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: squid:4 security, bug fix, and enhancement update

  • RHSA-2020:4082 Red Hat Product Security27 products fixed

    Red Hat Security Advisory: squid security update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2020:4743 · 30 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, the squid service will be restarted automatically.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2020-02-04
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-rmc2-g977-jr5r

Frequently asked questions

What is CVE-2020-8449?

An issue was discovered in Squid before 4.10. Due to incorrect input validation, it can interpret crafted HTTP requests in unexpected ways to access server resources prohibited by earlier security filters.

Is CVE-2020-8449 actively exploited?

Active exploitation of CVE-2020-8449 has not been confirmed. Its EPSS score was 8.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-8449?

CVE-2020-8449 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Sources for this record