CVE-2021-43859

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

7.93% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 94.2% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2022-02-01 12:08Z4 YR AGO

Last updated

2025-11-03 21:45Z10 MO AGO

Reserved

2021-11-16

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-400Uncontrolled Resource ConsumptionClass
• CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.2

Document digest

11177656338ee15479bd7cbbd73e040e8aea5fee3b3e3f1545cc1e7e58cdc32c

• github.comhttps://github.com/x-stream/xstream/security/advisories/GHSA-rmr5-cpv2-vgjfx_refsource_CONFIRM
• github.comhttps://github.com/x-stream/xstream/commit/e8e88621ba1c85ac3b8620337dd672e0c0c3a846x_refsource_MISC
• x-stream.github.iohttps://x-stream.github.io/CVE-2021-43859.htmlx_refsource_MISC
• www.openwall.com[oss-security] 20220209 Vulnerability in Jenkinshttp://www.openwall.com/lists/oss-security/2022/02/09/1mailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2022-ad5cf1c0ddhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XODFRE2ZL64FICBJDOPWOLPTSSAI4U7X/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2022-983a78275chttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VACQYG356OHUTD5WQGAQ4L2TTFTAV3SJ/vendor-advisoryx_refsource_FEDORA
• lists.debian.org[debian-lts-announce] 20220215 [SECURITY] [DLA 2924-1] libxstream-java security updatehttps://lists.debian.org/debian-lts-announce/2022/02/msg00018.htmlmailing-listx_refsource_MLIST
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.htmlx_refsource_MISC
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/12/msg00023.html