What’s Vulnerable › Vulnerabilities

CVE-2021-29508: Insecure deserialization in Wire

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-11 · updated 2026-06-17
• Weakness: CWE-502

Description

Due to how Wire handles type information in its serialization format, malicious payloads can be passed to a deserializer. e.g. using a surrogate on the sender end, an attacker can pass information about a different type for the receiving end. And by doing so allowing the serializer to create any type on the deserializing end. This is the same issue that exists for .NET BinaryFormatter https://docs.microsoft.com/en-us/visualstudio/code-quality/ca2300?view=vs-2019. This also applies to the fork of Wire.

Affected products

• AsynkronIT Wire: all versions

References

• https://github.com/AsynkronIT/Wire/security/advisories/GHSA-hpw7-3vq3-mmv6
• https://www.nuget.org/packages/Wire/
• https://github.com/AsynkronIT/Wire/security/advisories/GHSA-hpw7-3vq3-mmv6
• https://www.nuget.org/packages/Wire/

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