XStream can cause a Denial of Service
CVE-2021-21341

7.5HIGH

Key Information:

Vendor

X-stream

Status
Xstream
Vendor
CVE Published:
23 March 2021

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 26%

What is CVE-2021-21341?

XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is vulnerability which may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service 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. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.

Affected Version(s)

xstream < 1.4.16

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-21341
Created by s-index

ka-cve-2021-21341
Created by Mani1325

References

https://x-stream.github.io/security.html#workaround
x_refsource_MISC
http://x-stream.github.io/changes.html#1.4.16
x_refsource_MISC
https://github.com/x-stream/xstream/security/advisories/G...
x_refsource_CONFIRM

EPSS Score

26% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2021-21341 : XStream can cause a Denial of Service