7.5

CVE-2021-41611: fedoraproject fedora Improper Certificate Validation

CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2021-41611DEBIAN-CVE-2021-41611
Published 18-10-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-41611 is a high (CVSS 7.5) Improper Certificate Validation vulnerability in fedoraproject fedora. EPSS estimates a 2.95% chance of exploitation in the next 30 days, higher than 86.9% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
2.95%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-10-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Squid 5.0.6 through 5.1.x before 5.2. When validating an origin server or peer certificate, Squid may incorrectly classify certain certificates as trusted. This problem allows a remote server to obtain security trust well improperly. This indication of trust may be passed along to clients, allowing access to unsafe or hijacked services.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

2.95%

Chance of exploitation in the next 30 days

Percentile

87%

Versus all other CVEs

30-day change

0.00 pp

From 2.95% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.95%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Alpine1 product
  • squid≥ 5.0.6, < 5.0.6-r2 | ≥ 5.0.6, < 5.2-r0
Debian1 product
  • squid< 5.2-1
Fedoraproject1 product
Squid-cache1 product

4 vendors · 4 products

References

6 links