CVE-2021-39144

mediumpriority · act · 90OT risk · criticalKEV · exploitedEPSS 0.981 · 100 %ileexploit · weaponizedDEEURUUS
grimoire priorityP0 · Act now
Exploitable?
Yes · in the wild
CISA KEV · 1 exploit · weaponized
Likely / severe?
98.1% (100th) EPSS
CVSS 6 · medium
Is it mine?
71 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

added 2023-03-10remediate by 2023-03-31

required action Apply updates per vendor instructions.

EPSS · scored 2026-10-24

XStream Remote Code Execution Vulnerability

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose.

01

cvss

Technical severity, 0–10. One row per scoring source.

8.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6–8.5

v2.06mediumAV:N/AC:M/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 6.8 · impact 6.4
v3.18.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.8 · impact 6
v3.18.5highAV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.18.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · ENISA EU
v3.18.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · security-advisories@github.comexploitability 1.8 · impact 6
v3.18.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:Hsecondary · OSV
v3.18.5highCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

04

ATT&CK techniques

ATT&CK techniques this enables or maps to.

05

exploits (1)

Public proof-of-concept and weaponised exploit code.

06

affected products (71)

Products and version ranges known to be affected.

07

advisories (4)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2023-0682Red Hat Enterprise Linux (xstream): Mehrere SchwachstellenDeutsch2021-10-24csaf · cert_bundDE

    Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux in der Komponente xstream ausnutzen, um beliebigen Programmcode mit den Rechten des Dienstes auszuführen, einen Denial of Service Zustand herzustellen und vertrauliche Informationen offenzulegen.

  • WID-SEC-W-2023-0797Veritas NetBackup: Schwachstelle in genutzter KomponenteDeutsch2023-03-29csaf · cert_bundDE

    In der von Veritas NetBackup verwendeten Komponente "XStream" besteht eine kritische Schwachstelle. Die betroffene Komponente ist laut Veritas jedoch im Zusammenhang mit den Veritas Produkten nicht ausnutzbar.

  • WID-SEC-W-2026-0180Dell Data Protection Advisor: Mehrere SchwachstellenDeutsch2026-01-20csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Dell Data Protection Advisor ausnutzen, um beliebigen Code auszuführen, einen Denial-of-Service-Zustand zu erzeugen, Sicherheitsmaßnahmen zu umgehen und nicht näher spezifizierte Angriffe zu starten.

  • GHSA-j9h8-phrw-h4fhXStream is vulnerable to a Remote Command Execution attack2021-08-25ghsa · osvUS

    ### Impact The vulnerability may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. ### Patches XStream 1.4.18 uses no longer a blacklist by default, since it cannot be secured for general purpose. ### Workarounds See [workarounds](https://x-stream.github.io/security.html#workaround) for the different versions covering all CVEs. ### References See full information about the nature of the vulnerability and the steps to reproduce it in XStream's documentation for [CVE-2021-39144](https://x-stream.github.io/CVE-2021-39144.html). ### Credits Ceclin and YXXX from the Tencent Security Response Center found and reported the issue to XStream and provided the required information to reproduce it. ### For more information If you have any questions or comments about this advisory: * Open an issue in [XStream](https://github.com/x-stream/xstream/issues) * Email us at [XStream Google Group](https://groups.google.com/group/xstream-user)

08

also known as (5)

Other names and identifiers for this entity.

09

sources

Which sources assert this record, and when.

11

references (55)

External citations — patches, advisories, analysis.

scry

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