What’s Vulnerable › Vulnerabilities

CVE-2021-41119: DoS vulnerabiliity in wire-server json parser

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-04-13 · updated 2026-06-17
• Weakness: CWE-400

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.

Affected products

• Wire-Server: before 2022-03-01 — fixed in 2022-03-01

How to fix

Upgrade to a fixed version: Wire-Server 2022-03-01. Check the vendor advisory for mitigations.

References

• https://cs-syd.eu/posts/2021-09-11-json-vulnerability
• https://github.com/wireapp/wire-server/security/advisories/GHSA-phxv-pffh-fq2r
• https://cs-syd.eu/posts/2021-09-11-json-vulnerability
• https://github.com/wireapp/wire-server/security/advisories/GHSA-phxv-pffh-fq2r

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