CVE-2021-33620: Input Validation
First published: Fri May 28 2021(Updated: )
Squid before 4.15 and 5.x before 5.0.6 allows remote servers to cause a denial of service (affecting availability to all clients) via an HTTP response. The issue trigger is a header that can be expected to exist in HTTP traffic without any malicious intent by the server.
Credit: 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 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Debian Debian Linux | =9.0 |
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Reference Links
- http://seclists.org/fulldisclosure/2023/Oct/14
- http://www.openwall.com/lists/oss-security/2023/10/11/3
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-1e05a85bd28c22c9ca5d3ac9f5e86d6269ec0a8c.patch
- http://www.squid-cache.org/Versions/v5/changesets/squid-5-8af775ed98bfd610f9ce762fe177e01b2675588c.patch
- https://github.com/squid-cache/squid/security/advisories/GHSA-572g-rvwr-6c7f
- 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/
Frequently Asked Questions
What is CVE-2021-33620?
CVE-2021-33620 is a vulnerability in Squid before 4.15 and 5.x before 5.0.6 that allows remote servers to cause a denial of service by sending a specific HTTP response.
How does CVE-2021-33620 affect the availability of clients?
CVE-2021-33620 affects the availability of clients by causing a denial of service, making the service unavailable to all clients.
What is the severity of CVE-2021-33620?
CVE-2021-33620 has a severity value of 6.5, which is considered medium.
Which software versions are affected by CVE-2021-33620?
Squid versions before 4.15 and 5.x before 5.0.6 are affected by CVE-2021-33620.
How can I fix CVE-2021-33620?
To fix CVE-2021-33620, update your Squid installation to version 4.15 or higher if using the 4.x branch, or version 5.0.6 or higher if using the 5.x branch.
- agent/author
- agent/description
- agent/event
- agent/first-publish-date
- agent/last-modified-date
- agent/references
- agent/remedy
- agent/severity
- agent/softwarecombine
- agent/tags
- agent/type
- agent/weakness
- collector/nvd-api
- collector/nvd-index
- vendor/squid-cache
- canonical/squid-cache squid
- version/squid-cache squid/5.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0