{"cve":"CVE-2012-0021","nvd":{"published":"2012-01-28T04:05:00.750","modified":"2026-06-16T23:36:30.433","status":"Modified","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_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"references":["http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041","http://httpd.apache.org/security/vulnerabilities_22.html","http://lists.apple.com/archives/security-announce/2012/Sep/msg00004.html","http://marc.info/?l=bugtraq&m=133294460209056&w=2","http://marc.info/?l=bugtraq&m=133494237717847&w=2"],"products":["apache:http_server"],"source":"nvd","synced_at":"2026-10-19T19:59:31.623151214+00:00"},"epss":{"cve":"CVE-2012-0021","score":0.30337,"percentile":0.98229,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}