CVE-2021-28651
First published: Thu May 20 2021(Updated: )
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to a buffer-management bug, it allows a denial of service. When resolving a request with the urn: scheme, the parser leaks a small amount of memory. However, there is an unspecified attack methodology that can easily trigger a large amount of memory consumption.
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/squid | <=4.13-9<=4.6-1<=4.6-1+deb10u5 | 4.13-10 4.6-1+deb10u6 |
| debian/squid | 4.13-10+deb11u3 5.7-2+deb12u2 6.12-1 | |
| Squid Web Proxy Cache | >=2.0<4.15 | |
| Squid Web Proxy Cache | >=5.0<5.0.6 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| NetApp Cloud Manager |
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Reference Links
- https://security-tracker.debian.org/tracker/CVE-2021-28651
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-28651
- https://github.com/squid-cache/squid/security/advisories/GHSA-ch36-9jhx-phm4
- https://salsa.debian.org/squid-team/squid/-/merge_requests/17
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-a975fd5aedc866629214aaaccb38376855351899.patch
- https://github.com/squid-cache/squid/pull/778
- https://bugs.debian.org/988893
- https://security-tracker.debian.org/tracker/CVE-2021-28662
- https://security-tracker.debian.org/tracker/CVE-2021-28652
- https://security-tracker.debian.org/tracker/CVE-2021-31806
- https://security-tracker.debian.org/tracker/CVE-2021-31808
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988893
- http://seclists.org/fulldisclosure/2023/Oct/14
- http://www.openwall.com/lists/oss-security/2023/10/11/3
- https://bugs.squid-cache.org/show_bug.cgi?id=5104
- 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-2021-28651
- 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/urn-memleak.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-28651
- https://ubuntu.com/security/CVE-2021-28651
Frequently Asked Questions
What is CVE-2021-28651?
CVE-2021-28651 is a vulnerability in Squid before 4.15 and 5.x before 5.0.6 that allows a denial of service.
How does CVE-2021-28651 impact Squid?
CVE-2021-28651 allows an attacker to trigger a denial of service condition in Squid.
What is the severity of CVE-2021-28651?
CVE-2021-28651 has a severity rating of high (7.5).
Are there any known attack methodologies for CVE-2021-28651?
Yes, there is an unspecified attack methodology that can easily trigger the vulnerability.
How can I fix CVE-2021-28651?
To fix CVE-2021-28651, you should update Squid to version 4.15 or 5.0.6 or later, as recommended by the vendor.
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