CVE-2021-22569
Denial of Service of protobuf-java parsing procedure
- Published
- Jan 7, 2022
- Updated
- Apr 21, 2025
- Assigning CNA
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLow · next 30 days
- Percentile
- 75.4%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
An issue in protobuf-java allowed the interleaving of com.google.protobuf.UnknownFieldSet fields in such a way that would be processed out of order. A small malicious payload can occupy the parser for several minutes by creating large numbers of short-lived objects that cause frequent, repeated pauses. We recommend upgrading libraries beyond the vulnerable versions.
Sources
1- A-potential-Denial-of-Service-issue-in-protobuf-javaInformational
Detailed analysis of CVE-2021-22569, a high-severity denial-of-service vulnerability in protobuf-java, including affected versions, patched versions, and remediation guidance.
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.