CVE-2024-47252Network attack vector

Log tampering via unescaped TLS variables

Published Jul 10, 2025 · Updated Nov 4, 2025

Log injection in mod_ssl in Apache HTTP Server 2.4 through 2.4.63 allows remote attackers to insert escape characters into logs. When CustomLog uses "%{varname}x" or "%{varname}c" for mod_ssl variables such as SSL_TLS_SNI, neither mod_log_config nor mod_ssl escapes client input before writing it. Exposure requires that nondefault logging configuration; injected control sequences can falsify or obscure log presentation without altering server content.

CVSS severity7.5
High
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Log injection in mod_ssl in Apache HTTP Server 2.4 through 2.4.63 allows remote attackers to insert escape characters into logs. When CustomLog uses "%{varname}x" or "%{varname}c" for mod_ssl variables such as SSL_TLS_SNI, neither mod_log_config nor mod_ssl escapes client input before writing it. Exposure requires that nondefault logging configuration; injected control sequences can falsify or obscure log presentation without altering server content.

The record

CVE
CVE-2024-47252
Published
Jul 10, 2025
Updated
Nov 4, 2025
Vendor
The Apache Software Foundation
Product
Apache HTTP Server
Classifications
CWE-150, CAPEC-93, CAPEC-81, T1070
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.4 <=2.4.63

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache HTTP Serverversion=2.4 <=2.4.63

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-150Improper Neutralization of Escape, Meta, or Control Sequences
CAPEC-93Log Injection-Tampering-Forging
CAPEC-81Web Server Logs Tampering
T1070Indicator Removal

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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