CVE-2020-12460

Name: CVE-2020-12460
Creator: NVD / NIST
Published: 2020-07-27T23:15:12.373+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.68%

Last modified Jun 17, 2026

CVE-2020-12460 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 has improper null termination in the function opendmarc_xml_parse that can result in a one-byte heap overflow in opendmarc_xml when parsing a specially crafted DMARC aggregate report. This can cause remote memory corruption when a '\0' byte overwrites the heap metadata of the next chunk and its PREV_INUSE flag.. EPSS estimates a 3.68% chance of exploitation in the next 30 days.

Description

OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 has improper null termination in the function opendmarc_xml_parse that can result in a one-byte heap overflow in opendmarc_xml when parsing a specially crafted DMARC aggregate report. This can cause remote memory corruption when a '\0' byte overwrites the heap metadata of the next chunk and its PREV_INUSE flag.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.68%

88.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions	Update
Trusteddomain	Opendmarc	<= 1.3.2	—
Trusteddomain	Opendmarc	1.4.0	Beta0
Fedoraproject	Fedora	33	—
Fedoraproject	Fedora	34	—
Debian	Debian Linux	9.0	—

References

https://github.com/trusteddomainproject/OpenDMARC/issues/64Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00026.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2D4JGHMALEJEWWG56DKR5OZB22TK7W5B/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JHDKMCZGE3W4XBP76NLI2Q7IOZHXLD4A/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KBOGOQOK3TIWWJV66MW5YWNRJAFFYGR5/
https://security.gentoo.org/glsa/202011-02Third Party Advisory
https://sourceforge.net/projects/opendmarc/Product, Third Party Advisory
https://github.com/trusteddomainproject/OpenDMARC/issues/64Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00026.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2D4JGHMALEJEWWG56DKR5OZB22TK7W5B/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JHDKMCZGE3W4XBP76NLI2Q7IOZHXLD4A/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KBOGOQOK3TIWWJV66MW5YWNRJAFFYGR5/
https://security.gentoo.org/glsa/202011-02Third Party Advisory
https://sourceforge.net/projects/opendmarc/Product, Third Party Advisory

Timeline

Published: Jul 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12460?

How severe is CVE-2020-12460?

CVE-2020-12460 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.68% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12460?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-12460?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST