CVE-2021-43859

HIGHScheduled

Published:Feb 1, 2022(4 years ago)

Modified:Nov 3, 2025

Remote ExploitNo Auth RequiredNo InteractionLow Complexity

Vulnerability Description

XStream is an open source java library to serialize objects to XML and back again. Versions prior to 1.4.19 may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. XStream 1.4.19 monitors and accumulates the time it takes to add elements to collections and throws an exception if a set threshold is exceeded. Users are advised to upgrade as soon as possible. Users unable to upgrade may set the NO_REFERENCE mode to prevent recursion. See GHSA-rmr5-cpv2-vgjf for further details on a workaround if an upgrade is not possible.

Attack Characteristics

Network AccessLow ComplexityNo Auth NeededNo User Interaction

🤖

AI analysis not yet available

Plain-English explanation, risk summary, and remediation steps will appear here once AI analysis is complete.

No Fix Known

No patch has been released yet. Apply workarounds or mitigations where available.

Affected Software

Vendor	Product	Versions	Fixed In
jenkins	jenkins	2.319.3	-
jenkins	jenkins	2.321 - 2.334

Timeline

Published
CVE disclosed publicly
Feb 1, 20224 years ago
Last Modified
Most recent update
Nov 3, 20256 months ago
Indexed to CVEInsight
Added to this platform
Mar 29, 20261 month ago

References

http://www.openwall.com/lists/oss-security/2022/02/09/1Mailing List
https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd...Patch
https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2...Exploit

CVSS Score

v3.1

7.5/ 10.0

HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

At a Glance

Affected Products

References

jenkins / jenkins

https://lists.debian.org/debian-lts-announce/2022/02/msg00018.htmlMailing List

https://lists.fedoraproject.org/archives/list/package-announce%40lists...Mailing List

https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch

https://www.oracle.com/security-alerts/cpujul2022.htmlPatch

https://x-stream.github.io/CVE-2021-43859.htmlExploit

http://www.openwall.com/lists/oss-security/2022/02/09/1Mailing List

https://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd...Patch

https://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2...Exploit

https://lists.debian.org/debian-lts-announce/2022/02/msg00018.htmlMailing List

https://lists.debian.org/debian-lts-announce/2024/12/msg00023.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists...Mailing List

https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch

https://www.oracle.com/security-alerts/cpujul2022.htmlPatch

https://x-stream.github.io/CVE-2021-43859.htmlExploit

CVSS v3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Impact

ScopeUnchanged

ConfidentialityNone

IntegrityNone

AvailabilityHigh

Impact Analysis

ConfidentialityNone

NoneLowHigh

IntegrityNone

NoneLowHigh

AvailabilityHigh

NoneLowHigh

CVE-2021-43859

✦ Vulnerability Description

Attack Characteristics

Affected Software

Timeline

References

CVSS Score

At a Glance

Official Sources

CVSS v3 Vector

Impact Analysis

Vulnerability Description