7.5

CVE-2021-39242: debian debian_linux

CVSS: 7.5v3.1HighModified
AliasesDEBIAN-CVE-2021-39242
Published 17-08-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-39242 is a high (CVSS 7.5) vulnerability in debian debian_linux. EPSS estimates a 2.23% chance of exploitation in the next 30 days, higher than 82.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
2.23%
0%100%
Low · -0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3
DSA-4960-1RHSA-2021:4118RHSA-2021:5208

Timeline

  1. 17-08-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It can lead to a situation with an attacker-controlled HTTP Host header, because a mismatch between Host and authority is mishandled.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.23%

Chance of exploitation in the next 30 days

Percentile

83%

Versus all other CVEs

30-day change

-0.11 pp

From 2.34% on 21-09-2026

21-09-202621-10-2026
EPSS score
2.23%

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

Debian2 products
Fedoraproject1 product
Haproxy1 product
  • haproxy≥ 2.2.0, < 2.2.16 | ≥ 2.3.0, < 2.3.13 | ≥ 2.4.0, < 2.4.3

3 vendors · 4 products

References

6 links