CVE-2020-35766

Name: CVE-2020-35766
Creator: NVD / NIST
Published: 2020-12-28T20:15:13.26+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.52%

Last modified Jun 17, 2026

CVE-2020-35766 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. The test suite in libopendkim in OpenDKIM through 2.10.3 allows local users to gain privileges via a symlink attack against the /tmp/testkeys file (related to t-testdata.h, t-setup.c, and t-cleanup.c). NOTE: this is applicable to persons who choose to engage in the "A number of self-test programs are included here for unit-testing the library" situation.. EPSS estimates a 0.52% chance of exploitation in the next 30 days.

Description

The test suite in libopendkim in OpenDKIM through 2.10.3 allows local users to gain privileges via a symlink attack against the /tmp/testkeys file (related to t-testdata.h, t-setup.c, and t-cleanup.c). NOTE: this is applicable to persons who choose to engage in the "A number of self-test programs are included here for unit-testing the library" situation.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.52%

39.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-59

Affected Software

Vendor	Product	Versions
Opendkim	Opendkim	<= 2.10.3

References

https://github.com/trusteddomainproject/OpenDKIM/issues/113Exploit, Patch, Third Party Advisory
https://github.com/trusteddomainproject/OpenDKIM/issues/113Exploit, Patch, Third Party Advisory

Timeline

Published: Dec 28, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35766?

How severe is CVE-2020-35766?

CVE-2020-35766 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35766?

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-2020-35766?

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

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Source: NVD / NIST