CVE-2020-12460 Memory corruption in n/a

What is CVE-2020-12460?

CVE-2020-12460 is a critical memory corruption vulnerability in Debian Debian Linux, published on 27 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-787

Which versions are affected by CVE-2020-12460?

It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Trusteddomain Opendmarc.

How do I fix CVE-2020-12460?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-12460 being exploited?

There is no known exploitation of CVE-2020-12460 in the wild and no public exploit code.

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• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-12460, DLA-2639-1, GHSA-8c3p-8wh2-8ggf, UBUNTU-CVE-2020-12460.