CVE-2020-2102
Non-constant time HMAC comparison
5.3
MEDIUM
CVSS 3.1
EPSS 1.5%
Description
Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not use a constant-time comparison when checking whether two HMACs are equal. This could potentially allow attackers to use statistical methods to obtain a valid HMAC for an attacker-controlled input value. Jenkins 2.219, LTS 2.204.2 now uses a constant-time comparison when validating HMACs.
How to fix CVE-2020-2102
To remediate CVE-2020-2102, upgrade the affected package to a fixed version below.
- —upgrade to 2.218.1 or later
- —upgrade to 2.204.2 or later
Is CVE-2020-2102 being exploited?
Low — EPSS is 1.5%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.218.1
- from 0, < 2.204.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N |