CVE-2024-47252CWE-150

Apache HTTP Server: mod_ssl error log variable escaping

High · published July 10, 2025

CVSS v3.1
7.5
EPSS
1%
Percentile
56.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00795 · 56.0th percentile
Weakness
CWE-150 · Improper Neutralization of Escape, Meta, or Control Sequences
Published
2025-07-10T16:55Z
EPSS history
Timeline
  • 10 JUL 16:55Z
    Apache HTTP Server: mod_ssl error log variable escaping
    cvelistv5