CVE-2021-31808: debian debian_linux Integer Overflow or Wraparound
CVSS: 6.5v3.1MediumModified
AliasesALPINE-CVE-2021-31808UBUNTU-CVE-2021-31808DEBIAN-CVE-2021-31808
Published 27-05-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-31808 is a medium (CVSS 6.5) Integer Overflow or Wraparound vulnerability in debian debian_linux. EPSS estimates a 5.34% chance of exploitation in the next 30 days, higher than 92.5% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
5.34%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 5 · Related 1Timeline
- 27-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP Range request to trigger this.
CVSS metrics
5 scores · 4 sources · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- OSV · AlpineEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Medium 4.0Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
5.34%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
0.00 pp
From 5.34% on 18-09-2026
18-09-202618-10-2026
EPSS score5.34%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (squid-cache.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian2 products
- squid< 4.13-10
- debian_linuxEOL9.0 | 10.0
Ubuntu2 products
- squid< 4.10-1ubuntu1.4
- squid3All versions (No fix recorded) | < 3.5.27-1ubuntu1.11
Alpine1 product
- squid≥ 5.0, < 4.15-r0 | ≥ 5.0, < 5.0.6-r0
Fedoraproject1 product
- fedoraEOL33 | 34
Netapp1 product
Squid-cache1 product
- squid< 4.15 | ≥ 5.0, < 5.0.6
6 vendors · 8 products
References
14 links- www.squid-cache.org/Versions/v4/changesets/squid-4-e7cf864f938f24eea8af0692c04d16790983c823.patchExploitPatchVendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- security.netapp.com/advisory/ntap-20210716-0007/Third Party Advisory