Vulnerability Details : CVE-2021-31806
Public exploit exists!
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.
Vulnerability category: Denial of service
Threat overview for CVE-2021-31806
Top countries where our scanners detected CVE-2021-31806
Top open port discovered on systems with this issue
3128
IPs affected by CVE-2021-31806 2,092,123
Threat actors abusing to this issue?
Yes
Find out if you* are
affected by CVE-2021-31806!
*Directly or indirectly through your vendors, service providers and 3rd parties.
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attack surface intelligence
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Exploit prediction scoring system (EPSS) score for CVE-2021-31806
91.62%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 99 %
Percentile, the proportion of vulnerabilities that are scored at or less
Metasploit modules for CVE-2021-31806
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Squid Proxy Range Header DoS
Disclosure Date: 2021-05-27First seen: 2022-12-23auxiliary/dos/http/squid_range_dosThe range handler in The Squid Caching Proxy Server 3.0-4.1.4 and 5.0.1-5.0.5 suffers from multiple vulnerabilities triggered by specific HTTP requests and responses. These vulnerabilities allow remote attackers to cause a denial of service through
CVSS scores for CVE-2021-31806
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.0
|
MEDIUM | AV:N/AC:L/Au:S/C:N/I:N/A:P |
8.0
|
2.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
2.8
|
3.6
|
NIST |
CWE ids for CVE-2021-31806
-
The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-31806
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https://www.debian.org/security/2021/dsa-4924
Debian -- Security Information -- DSA-4924-1 squidThird Party Advisory
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http://seclists.org/fulldisclosure/2023/Oct/14
Full Disclosure: Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days.Mailing List;Third Party Advisory
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http://www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patch
Patch;Vendor Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LSQ3U54ZCNXR44QRPW3AV2VCS6K3TKCF/
[SECURITY] Fedora 34 Update: squid-5.0.6-1.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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http://www.openwall.com/lists/oss-security/2023/10/11/3
oss-security - Squid Caching Proxy Security Audit: 55 Vulnerabilities, 35 0days.Mailing List;Third Party Advisory
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https://security.netapp.com/advisory/ntap-20210716-0007/
June 2021 Squid Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T4EPIWUZDJAXADDHVOPKRBTQHPBR6H66/
[SECURITY] Fedora 33 Update: squid-4.15-1.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf
SQUID-2021:4 Multiple Issues in HTTP Range header · Advisory · squid-cache/squid · GitHubPatch;Third Party Advisory
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https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html
[SECURITY] [DLA 2685-1] squid3 security updateMailing List;Third Party Advisory
Products affected by CVE-2021-31806
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:cloud_manager:-:*:*:*:*:*:*:*
- cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
- cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*