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Vulnerability record · CVE-2021-22569 · published 10 January 2022

CVE-2021-22569: Google-protobuf vulnerability

Google · Google Protobuf

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.

5.5 CVSS 3.1 Medium EPSS 1.7% · top 24.2% CWE-696 · CWE-696
5.5CVSS 3.1 base score, v2 4.3
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2022/01/12/4 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/12/7 Mailing ListThird Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39330 ExploitIssue TrackingMailing ListVendor Advisory
https://cloud.google.com/support/bulletins#gcp-2022-001 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/04/msg00019.html
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/12/4 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/12/7 Mailing ListThird Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39330 ExploitIssue TrackingMailing ListVendor Advisory
https://cloud.google.com/support/bulletins#gcp-2022-001 Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/04/msg00019.html
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-22569), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.