UpHeron
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Servers and applications

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_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.

Severity
Medium 6.8
Published
31 Oct 2012
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
8.4% in the next 30 daysHigher than 95% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Memory buffer errors (CWE-119)
Attack
Over the network · No login needed
Attacker can
Read some data · Change some data · Slow it down
CVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:P
Sources
NVD

Affected software

SoftwareAffected versions
EximServers and applications · cpe:a:exim:exim
  • Version 4.80
  • Version 4.77
  • Version 4.76
  • Version 4.75
All 9 release lines
  • Version 4.70
  • Version 4.71
  • Version 4.72
  • Version 4.73
  • Version 4.74
  • Version 4.75
  • Version 4.76
  • Version 4.77
  • Version 4.80

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2012-5671
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2012-5671