CVE-2021-3642

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.

Published: 2021-08-05 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-3642 is rated Low Risk (38.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.27%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-3642

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-08-09 0.38% 0.27% -0.11%
2 2025-08-05 0.22% 0.38% +0.16%
3 2025-03-30 — 0.22% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-3642

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 1.6 3.6 [email protected]
3.5 2.0 LOW
AV:N/AC:M/Au:S/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 6.8 2.9 [email protected]

Weakness enumeration for CVE-2021-3642

GitHub Security Advisory for CVE-2021-3642

GHSA-5499-qjvh-6j7w · Severity: medium · Ecosystem: maven — Observable Discrepancy in Wildfly Elytron

OS Trackers for CVE-2021-3642

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2021-3642

Affected software / configurations for CVE-2021-3642

Vendor Product Version Raw CPE
redhat wildfly_elytron < 1.10.14 cpe:2.3:a:redhat:wildfly_elytron:*:*:*:*:*:*:*:*
redhat wildfly_elytron >= 1.11.0, < 1.15.5 cpe:2.3:a:redhat:wildfly_elytron:*:*:*:*:*:*:*:*
redhat wildfly_elytron >= 1.16.0, < 1.16.1 cpe:2.3:a:redhat:wildfly_elytron:*:*:*:*:*:*:*:*
redhat build_of_quarkus — cpe:2.3:a:redhat:build_of_quarkus:-:*:*:*:*:*:*:*
redhat codeready_studio 12.0 cpe:2.3:a:redhat:codeready_studio:12.0:*:*:*:*:*:*:*
redhat data_grid 8.0 cpe:2.3:a:redhat:data_grid:8.0:*:*:*:*:*:*:*
redhat descision_manager 7.0 cpe:2.3:a:redhat:descision_manager:7.0:*:*:*:*:*:*:*
redhat integration_camel_k — cpe:2.3:a:redhat:integration_camel_k:-:*:*:*:*:*:*:*
redhat integration_camel_quarkus — cpe:2.3:a:redhat:integration_camel_quarkus:*:*:*:*:*:*:*:*
redhat jboss_enterprise_application_platform 7.0.0 cpe:2.3:a:redhat:jboss_enterprise_application_platform:7.0.0:*:*:*:*:*:*:*
redhat jboss_enterprise_application_platform_expansion_pack — cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*
redhat jboss_fuse 7.0.0 cpe:2.3:a:redhat:jboss_fuse:7.0.0:*:*:*:*:*:*:*
redhat openshift_application_runtimes — cpe:2.3:a:redhat:openshift_application_runtimes:-:*:*:*:*:*:*:*
redhat process_automation 7.0 cpe:2.3:a:redhat:process_automation:7.0:*:*:*:*:*:*:*
quarkus quarkus <= 2.1.4 cpe:2.3:a:quarkus:quarkus:*:*:*:*:*:*:*:*

References for CVE-2021-3642

URL Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1981407 Issue Tracking Vendor Advisory
cvelogic Threat Intelligence