CVE-2021-39153

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 ImpacttotalSuccessful exploitation gives total 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

4.45% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 91.0% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Important. 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

2021-08-23 17:55Z5 YR AGO

Last updated

2026-10-07 20:03Z21 DAYS AGO

Reserved

2021-08-16

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.5)

CNA CVSS vector

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

Weaknesses

• CWE-434Unrestricted Upload of File with Dangerous TypeBase
• CWE-502Deserialization of Untrusted DataBase

Data version

5.2

Document digest

f93ef1649ff2e450b148af35893b5e61a3f9fbb6fdc37811719f283fa92ff0a2

• github.comhttps://github.com/x-stream/xstream/security/advisories/GHSA-2q8x-2p7f-574vx_refsource_CONFIRM
• x-stream.github.iohttps://x-stream.github.io/CVE-2021-39153.htmlx_refsource_MISC
• lists.debian.org[debian-lts-announce] 20210929 [SECURITY] [DLA 2769-1] libxstream-java security updatehttps://lists.debian.org/debian-lts-announce/2021/09/msg00017.htmlmailing-listx_refsource_MLIST
• 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
• 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
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210923-0003/x_refsource_CONFIRM
• www.oracle.comhttps://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISC
• www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.htmlx_refsource_MISC