Apache HTTP Server: mod_ssl error log variable escaping
Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in some configurations. In a logging configuration where CustomLog is used with "%{varname}x" or "%{varname}c" to log variables provided by mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and unsanitized data provided by the client may appear in log files.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2024-47252US | — | — | ||
Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in som… | ||||
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references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2025/07/10/2WEB
- http://www.openwall.com/lists/oss-security/2025/07/10/6WEB
- https://httpd.apache.org/security/vulnerabilities_24.htmlADVISORY
- https://lists.debian.org/debian-lts-announce/2025/08/msg00009.htmlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2024-47252WEB
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