CVE-2020-35766
CVE-2020-35766 is a high-severity vulnerability in Opendkim with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-59.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v2: 4.4
- EPSS exploit prediction: 1% (40th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-59
- Affected product: Opendkim
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2020-35766?
- 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.
- How severe is CVE-2020-35766?
- CVE-2020-35766 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2020-35766 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-35766?
- CVE-2020-35766 affects Opendkim. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-35766?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-35766 published?
- CVE-2020-35766 was published on 2020-12-28 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:opendkim:opendkim:*:*:*:*:*:*:*:*
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