CVE-2021-21343

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• 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

46.66% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 98.7% 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:H/A:N

NVD analysis status

Analyzed. NVD last modified this record on 2026-10-07.

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

2021-03-22 23:40Z5 YR AGO

Last updated

2026-10-07 18:44Z22 DAYS AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

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

Weaknesses

• CWE-73External Control of File Name or PathBase
• CWE-502Deserialization of Untrusted DataBase

Data version

5.2

Document digest

c6f6548f147696c3bf1b071899311e2187c3df44956c5b8cfe5acd97bccc6f34

• x-stream.github.iohttps://x-stream.github.io/security.html#workaroundx_refsource_MISC
• x-stream.github.iohttp://x-stream.github.io/changes.html#1.4.16x_refsource_MISC
• github.comhttps://github.com/x-stream/xstream/security/advisories/GHSA-74cv-f58x-f9wfx_refsource_CONFIRM
• x-stream.github.iohttps://x-stream.github.io/CVE-2021-21343.htmlx_refsource_MISC
• lists.debian.org[debian-lts-announce] 20210403 [SECURITY] [DLA 2616-1] libxstream-java security updatehttps://lists.debian.org/debian-lts-announce/2021/04/msg00002.htmlmailing-listx_refsource_MLIST
• lists.apache.org[jmeter-dev] 20210406 [GitHub] [jmeter] sseide opened a new pull request #655: update x-stream to 1.4.16 (from 1.4.15)https://lists.apache.org/thread.html/r9ac71b047767205aa22e3a08cb33f3e0586de6b2fac48b425c6e16b0%40%3Cdev.jmeter.apache.org%3Emailing-listx_refsource_MLIST
• lists.apache.org[activemq-users] 20210427 Release date for ActiveMQ v5.16.2 to fix CVEshttps://lists.apache.org/thread.html/r8244fd0831db894d5e89911ded9c72196d395a90ae655414d23ed0dd%40%3Cusers.activemq.apache.org%3Emailing-listx_refsource_MLIST
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210430-0002/x_refsource_CONFIRM
• www.oracle.comhttps://www.oracle.com//security-alerts/cpujul2021.htmlx_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-fbad11014ahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-d894ca87dchttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB/vendor-advisoryx_refsource_FEDORA
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-5e376c0ed9https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7/vendor-advisoryx_refsource_FEDORA
• www.debian.orgDSA-5004https://www.debian.org/security/2021/dsa-5004vendor-advisoryx_refsource_DEBIAN
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujan2022.htmlx_refsource_MISC