CVE-2021-41119

Public Exploit
DoS vulnerabiliity in wire-server json parser

Description

Wire-server is the system server for the wire back-end services. Releases prior to v2022-03-01 are subject to a denial of service attack via a crafted object causing a hash collision. This collision causes the server to spend at least quadratic time parsing it which can lead to a denial of service for a heavily used server. The issue has been fixed in wire-server 2022-03-01 and is already deployed on all Wire managed services. On premise instances of wire-server need to be updated to 2022-03-01, so that their backends are no longer affected. There are no known workarounds for this issue.

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.41%
Third-Party Advisory cs-syd.eu Third-Party Advisory github.com
Affected: wireapp wire-server
Published at:
Updated at:

References

Link Tags
https://github.com/wireapp/wire-server/security/advisories/GHSA-phxv-pffh-fq2r third party advisory
https://cs-syd.eu/posts/2021-09-11-json-vulnerability third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-41119?
CVE-2021-41119 has been scored as a medium severity vulnerability.
How to fix CVE-2021-41119?
To fix CVE-2021-41119, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-41119 being actively exploited in the wild?
It is possible that CVE-2021-41119 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-41119?
CVE-2021-41119 affects wireapp wire-server.
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