# CVE-2024-47252: Apache HTTP Server: mod_ssl error log variable escaping

> An attacker can inject escape characters into Apache log files via SSL/TLS data when specific custom logging variables are configured.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Jul 2025
- **Updated:** 4 Nov 2025
- **Also known as:** ALPINE-CVE-2024-47252, AZL-65172, AZL-65226, BELL-CVE-2024-47252, BIT-apache-2024-47252, CLSA-2025-1756830276, DEBIAN-CVE-2024-47252, GHSA-2qfr-q5v6-m43q, MINI-j77g-348h-hrxh, UBUNTU-CVE-2024-47252

## What is CVE-2024-47252?

CVE-2024-47252 is a high-severity vulnerability in Apache Http Server, published on 10 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-150 (Improper Neutralization of Escape, Meta, or Control Sequences)

## Which versions are affected by CVE-2024-47252?

1 open source package ship an affected version, including apache. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `apache` | Bitnami | From 2.4.0 | 2.4.64 |

Products: Apache Http Server.

## How do I fix CVE-2024-47252?

Upgrade apache to 2.4.64 or later.

## Is CVE-2024-47252 being exploited?

There is no known exploitation of CVE-2024-47252 in the wild and no public exploit code.

## Other vulnerabilities in Apache Http Server

- [CVE-2021-42013](https://insights.sbomify.com/CVE-2021-42013/): Apache HTTP Server Path Traversal (critical 9.8, exploited in the wild)
- [CVE-2024-38475](https://insights.sbomify.com/CVE-2024-38475/): Apache HTTP Server Improper Escaping of Output (critical 9.1, exploited in the wild)
- [CVE-2021-40438](https://insights.sbomify.com/CVE-2021-40438/): Apache HTTP Server-Side Request Forgery (SSRF) (critical 9.0, exploited in the wild)
- [CVE-2019-0211](https://insights.sbomify.com/CVE-2019-0211/): Apache HTTP Server Privilege Escalation (high 7.8, exploited in the wild)
- [CVE-2021-41773](https://insights.sbomify.com/CVE-2021-41773/): Apache HTTP Server Path Traversal (high 7.5, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-47252 and fix it if it is affected.

What it is: CVE-2024-47252 is a high-severity vulnerability in Apache Http Server, published on 10 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-47252 in the wild and no public exploit code.

Affected packages and fixed versions:
- apache (Bitnami): affected from 2.4.0; fixed in 2.4.64

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-47252/ (Markdown: https://insights.sbomify.com/CVE-2024-47252/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-47252
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-47252
- OSV: https://osv.dev/vulnerability/CVE-2024-47252

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-47252/
Summaries are generated and may contain mistakes; the official description above is the record.