HOMEVULNERABILITIESCVE-2021-29505
HIGH

CVE-2021-29505

CWE-94Published: May 28, 2021· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official Description

XStream is software for serializing Java objects to XML and back again. A vulnerability in XStream versions prior to 1.4.17 may allow a remote attacker has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types is affected. The vulnerability is patched in version 1.4.17.

NVD Source

Technical Analysis

CVE-2021-29505 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
netapp1 product(s)
snapmanager
Oracle13 product(s)
banking cash managementbanking corporate lending process managementbanking credit facilities process managementbanking supply chain financebanking trade finance process managementbusiness activity monitoringcommunications brm - elastic charging enginecommunications unified inventory managemententerprise manager ops centerretail customer insightsretail xstore point of servicewebcenter portal+1
xstream1 product(s)
xstream
Source: NVD CPE · 41 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/x-stream/xstream/commit/24fac82191292c6ae25f94508d28b9823f83624f
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html
PATCHhttps://github.com/x-stream/xstream/commit/24fac82191292c6ae25f94508d28b9823f83624f
PATCHhttps://www.oracle.com/security-alerts/cpuapr2022.html
PATCHhttps://www.oracle.com/security-alerts/cpujan2022.html
ADVISORYhttps://github.com/x-stream/xstream/security/advisories/GHSA-7chv-rrw6-w6fc
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/07/msg00004.html
ADVISORYhttps://www.debian.org/security/2021/dsa-5004
ADVISORYhttps://www.oracle.com/security-alerts/cpujul2022.html
ADVISORYhttps://www.oracle.com/security-alerts/cpuoct2021.html
ADVISORYhttps://github.com/x-stream/xstream/security/advisories/GHSA-7chv-rrw6-w6fc
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/07/msg00004.html
ADVISORYhttps://security.netapp.com/advisory/ntap-20210708-0007/
ADVISORYhttps://www.debian.org/security/2021/dsa-5004
ADVISORYhttps://www.oracle.com/security-alerts/cpujul2022.html
ADVISORYhttps://www.oracle.com/security-alerts/cpuoct2021.html

All References (28)

→
https://github.com/x-stream/xstream/commit/24fac82191292c6ae25f94508d28b9823f83624fPatch · Third Party Advisory
→
https://github.com/x-stream/xstream/commit/f0c4a8d861b68ffc3119cfbbbd632deee624e227
→
https://github.com/x-stream/xstream/security/advisories/GHSA-7chv-rrw6-w6fcThird Party Advisory
→
https://lists.apache.org/thread.html/r8ee51debf7fd184b6a6b020dc31df25118b0aa612885f12fbe77f04f@%3Cdev.jmeter.apache.org%3E
→
https://lists.debian.org/debian-lts-announce/2021/07/msg00004.htmlMailing List · Third Party Advisory
→
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/22KVR6B5IZP3BGQ3HPWIO2FWWCKT3DHP
→
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PVPHZA7VW2RRSDCOIPP2W6O5ND254TU7
→
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGXIU3YDPG6OGTDHMBLAFN7BPBERXREB
→
https://security.netapp.com/advisory/ntap-20210708-0007
→
https://www.debian.org/security/2021/dsa-5004Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlThird Party Advisory
→
https://www.oracle.com/security-alerts/cpuoct2021.htmlMailing List · Third Party Advisory
→
https://x-stream.github.io/CVE-2021-29505.html

Quick Facts

CVE IDCVE-2021-29505
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-94
CISA KEVNo
Affected5 vendor(s)
PublishedMay 28, 2021

Related CVEs (CWE-94)

CVE-2026-25470
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CVE-2026-28505
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CVE-2026-10561
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CVE-2026-26332
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CVE-2024-49254
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CVE-2026-39337
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Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-29505 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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