CVE-2012-4557: apache http_server Resource Management Errors
Vulnerability summary
CVE-2012-4557 is a medium (CVSS 5.0) Resource Management Errors vulnerability in apache http_server. EPSS estimates a 17.47% chance of exploitation in the next 30 days, higher than 97.1% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 5, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3Timeline
- 30-11-2012PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
The mod_proxy_ajp module in the Apache HTTP Server 2.2.12 through 2.2.21 places a worker node into an error state upon detection of a long request-processing time, which allows remote attackers to cause a denial of service (worker consumption) via an expensive request.
CVSS metrics
1 score · 1 source · 1 versionEPSS trend
Probability
17.47%
Chance of exploitation in the next 30 days
Percentile
97%
Versus all other CVEs
30-day change
No change 0.00 pp
From 17.47% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (svn.apache.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication (CVSS vector). Other conditions: not stated in public data.
Apache1 product
- http_serverEOL2.2.12 | 2.2.13 | 2.2.14 | 2.2.15 | 2.2.16 | 2.2.17 | 2.2.18 | 2.2.19 | 2.2.20 | 2.2.21
Debian1 product
- apache2< 2.2.22-1
2 vendors · 2 products
References
24 links
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18938VDB EntrySignatureX Refsource OVAL
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A19284VDB EntrySignatureX Refsource OVAL
- bugzilla.redhat.com/show_bug.cgi?id=871685X Refsource CONFIRM