CVE-2020-35766
The test suite in libopendkim in OpenDKIM through 2.10.3 allows local users to gain privileges...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2020-35766- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 4.4 Medium
AV:L/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-59
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2020-35766- Updated
- 2026-11-02
EUVDEUVD-2020-23422 No score
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.
- Record
EUVD-2020-23422- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-q8qf-8pcx-vfw7 No score
The test suite in libopendkim in OpenDKIM through 2.10.3 allows local users to gain privileges...
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.
- Record
GHSA-q8qf-8pcx-vfw7- Weakness
- CWE-59
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2020-35766- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-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.
- Record
DEBIAN-CVE-2020-35766- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-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.
- Record
UBUNTU-CVE-2020-35766- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
opendkimDebian:12 |
All versions, plus listed versions 2.11.0~beta2-82.11.0~beta2-8+deb12u12.11.0~beta2-92.11.0~beta2-9.12.11.0~beta2-9.2 |
None known |
opendkimDebian:13 |
All versions, plus listed versions 2.11.0~beta2-9.12.11.0~beta2-9.2 |
None known |
opendkimDebian:14 |
All versions, plus listed versions 2.11.0~beta2-9.12.11.0~beta2-9.2 |
None known |
opendkimUbuntu:16.04:LTS |
All versions, plus listed versions 2.10.3-3build1 |
None known |
opendkimUbuntu:18.04:LTS |
All versions, plus listed versions 2.11.0~alpha-102.11.0~alpha-112.11.0~alpha-11build1 |
None known |
opendkimUbuntu:20.04:LTS |
All versions, plus listed versions 2.11.0~alpha-122.11.0~alpha-132.11.0~alpha-142.11.0~beta2-1 |
None known |
opendkimUbuntu:22.04:LTS |
All versions, plus listed versions 2.11.0~beta2-4build12.11.0~beta2-52.11.0~beta2-6 |
None known |
opendkimUbuntu:24.04:LTS |
All versions, plus listed versions 2.11.0~beta2-82.11.0~beta2-92.11.0~beta2-9build32.11.0~beta2-9build4 |
None known |
opendkimUbuntu:25.10 |
All versions, plus listed versions 2.11.0~beta2-9.12.11.0~beta2-9.2 |
None known |
opendkimUbuntu:26.10 |
All versions, plus listed versions 2.11.0~beta2-9.2build12.11.0~beta2-9.2build2 |
None known |
opendkimUbuntu:26.04:LTS |
All versions, plus listed versions 2.11.0~beta2-9.22.11.0~beta2-9.2build1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-35766 is a high vulnerability (CVSS 7.8) in Opendkim, published December 28, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. No source names a fixed version.