CVE-2021-21604: jenkins project jenkins Deserialization of Untrusted Data
Vulnerability summary
CVE-2021-21604 is a high (CVSS 8.0) Deserialization of Untrusted Data vulnerability in jenkins project jenkins. EPSS estimates a 1.70% chance of exploitation in the next 30 days, higher than 77.1% of scored vulnerabilities.
Not severe (CVSS 8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4Timeline
- 13-01-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows attackers with permission to create or configure various objects to inject crafted content into Old Data Monitor that results in the instantiation of potentially unsafe objects once discarded by an administrator.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · MavenEcosystem advisory · calculated8.0HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
- OSV · AlpineEcosystem advisory · calculated8.0HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.70%
Chance of exploitation in the next 30 days
Percentile
77%
Versus all other CVEs
30-day change
Increase +0.02 pp
From 1.68% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- jenkins< 2.275-r0
Jenkins1 product
- jenkins≤ 2.263.1 | ≤ 2.274
Jenkins project1 product
- jenkins≥ unspecified, ≤ 2.274 | ≥ unspecified, ≤ LTS 2.263.1
Org.jenkins-ci.main1 product
- jenkins-core< 2.263.2 | ≥ 2.264, < 2.275
4 vendors · 4 products
References
5 links
- github.com/jenkinsci/jenkinsPACKAGE