CVE-2021-3642: quarkus Observable Discrepancy
Vulnerability summary
CVE-2021-3642 is a medium (CVSS 5.3) Observable Discrepancy vulnerability in quarkus. EPSS estimates a 0.85% chance of exploitation in the next 30 days, higher than 58.1% of scored vulnerabilities.
Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 5Timeline
- 05-08-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in Wildfly Elytron in versions prior to 1.10.14.Final, prior to 1.15.5.Final and prior to 1.16.1.Final where ScramServer may be susceptible to Timing Attack if enabled. The highest threat of this vulnerability is confidentiality.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · MavenEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.85%
Chance of exploitation in the next 30 days
Percentile
58%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.85% 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, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat11 products
Org.wildfly.security1 product
- wildfly-elytron< 1.10.14 | ≥ 1.11.0, < 1.15.5 | ≥ 1.16.0, < 1.16.1
Quarkus1 product
- quarkus≤ 2.1.4
3 vendors · 13 products
