CVE-2021-31806
First published: Mon May 24 2021(Updated: )
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a memory-management bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy) via HTTP Range request processing.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Squid-Cache Squid | <4.15 | |
| Squid-Cache Squid | >=5.0<5.0.6 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| NetApp Cloud Manager | ||
| debian/squid | 4.13-10+deb11u3 5.7-2+deb12u2 6.12-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://security-tracker.debian.org/tracker/CVE-2021-31806
- https://security-tracker.debian.org/tracker/CVE-2021-31807
- https://security-tracker.debian.org/tracker/CVE-2021-31808
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31806
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31807
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-31808
- https://bugzilla.suse.com/show_bug.cgi?id=1185916
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patch
- http://manty.net
- https://security-tracker.debian.org/tracker/CVE-2021-28651
- https://security-tracker.debian.org/tracker/CVE-2021-28662
- https://security-tracker.debian.org/tracker/CVE-2021-28652
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989043
- http://seclists.org/fulldisclosure/2023/Oct/14
- http://www.openwall.com/lists/oss-security/2023/10/11/3
- https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf
- https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
- https://security.netapp.com/advisory/ntap-20210716-0007/
- https://www.debian.org/security/2021/dsa-4924
- https://launchpad.net/bugs/cve/CVE-2021-31806
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
- https://megamansec.github.io/Squid-Security-Audit/range-assert.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-31806
- https://ubuntu.com/security/CVE-2021-31806
Frequently Asked Questions
What is CVE-2021-31806?
CVE-2021-31806 is a vulnerability in Squid before 4.15 and 5.x before 5.0.6 that allows a Denial of Service attack via HTTP Range request processing.
How severe is CVE-2021-31806?
CVE-2021-31806 has a severity rating of 6.5 (high).
Which software versions are affected by CVE-2021-31806?
CVE-2021-31806 affects Squid versions before 4.15 and 5.x before 5.0.6.
How can I fix CVE-2021-31806?
To fix CVE-2021-31806, update Squid to version 4.15 or 5.0.6 or later.
Where can I find more information about CVE-2021-31806?
You can find more information about CVE-2021-31806 on the Debian security tracker website.
- collector/debian-bugs
- alias/CVE-2021-31806
- collector/nvd-index
- collector/nvd-api
- agent/first-publish-date
- agent/type
- agent/severity
- agent/weakness
- agent/remedy
- collector/launchpad-cve
- source/Launchpad
- agent/author
- collector/mitre-cve
- source/MITRE
- collector/usn-cve
- source/Ubuntu
- agent/references
- agent/tags
- agent/description
- agent/event
- collector/security-tracker-debian
- source/Debian
- agent/software-canonical-lookup
- agent/softwarecombine
- collector/nvd-cve
- source/NVD
- agent/last-modified-date
- agent/trending
- vendor/squid-cache
- canonical/squid-cache squid
- version/squid-cache squid/5.0
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34
- vendor/netapp
- canonical/netapp cloud manager
- package-manager/debian