2.6

CVE-2012-0021: apache http_server Improper Input Validation

CVSS: 2.6v2.0LowModified
AliasesDEBIAN-CVE-2012-0021
Published 28-01-2012Last modified 06-08-2024
Open JSON

Vulnerability summary

CVE-2012-0021 is a low (CVSS 2.6) Improper Input Validation vulnerability in apache http_server. EPSS estimates a 30.34% chance of exploitation in the next 30 days, higher than 98.2% of scored vulnerabilities.

Overall risk
16/100
0100
Low · default modelHow is this calculated?
CVSS score
2.6/10
010
Low · v2.0 (NVD)
EPSS score
30.34%
0%100%
High · +0.51 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 · Related 2
OPENSUSE-SU-2024:10268-1RHSA-2012:0542SUSE-SU-2017:2907-1

Timeline

  1. 28-01-2012
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

Description

The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

30.34%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

+0.51 pp

From 29.83% on 19-09-2026

19-09-202619-10-2026
EPSS score
30.34%

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

Apache1 product
  • http_serverEOL2.2.17 | 2.2.18 | 2.2.19 | 2.2.20 | 2.2.21
Debian1 product
  • apache2< 2.2.22-1

2 vendors · 2 products

References

29 links
Show all 29 references