CVE-2024-47252
CVE-2024-47252 is a high-severity vulnerability in Apache Http Server with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-150.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 1% (47th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2024-54773
- Weakness: CWE-150
- Affected product: Apache Http Server
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2024-47252?
- 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.
- How severe is CVE-2024-47252?
- CVE-2024-47252 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2024-47252 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2024-47252?
- CVE-2024-47252 affects Apache Http Server. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2024-47252?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2024-47252 have an EU (EUVD) identifier?
- Yes. CVE-2024-47252 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-54773.
- When was CVE-2024-47252 published?
- CVE-2024-47252 was published on 2025-07-10 and last updated on 2026-06-17.
References
- https://httpd.apache.org/security/vulnerabilities_24.html
- http://www.openwall.com/lists/oss-security/2025/07/10/2
- http://www.openwall.com/lists/oss-security/2025/07/10/6
- https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html
Affected products (1)
- cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
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Threat intelligence
Threat-intel indicators referencing this CVE:
- 37.120.213.13 (ipv4-addr)
- 50.255.62.89 (ipv4-addr)
- 147.15.15.226 (ipv4-addr)
- 45.84.120.3 (ipv4-addr)
- 77.90.185.88 (ipv4-addr)
- 77.90.185.87 (ipv4-addr)
- 74.87.117.150 (ipv4-addr)
- 61.76.112.4 (ipv4-addr)