Vulnerability Database · Debian · protobuf · Version
protobuf 3.21.9-4
3.21.9-4 is affected by 9 vulnerabilities.
The vulnerabilities that cover this exact version are listed below with the fixed version to move to.
Critical 0 High 5 Medium 1 Low 0 Unrated 3
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Database updated 23/Oct/2026
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01 Vulnerabilities affecting this version
protobuf 3.21.9-4 vulnerabilities
9 vulnerabilities cover protobuf 3.21.9-4. Open the full list in the database.
| Vulnerability | Severity | Fixed version | Disclosed |
|---|---|---|---|
| Heap-based Buffer Overflow in protobuf | 8.8 high | No fix published | 25 Sep 2017 |
| Stack Overflow Vulnerability in Protobuf Package: CVE-2024-7254 | 7.5 high | No fix published | 19 Sep 2024 |
| Denial of Service Vulnerability in Protobuf Package: CVE-2022-3509 | 7.5 high | No fix published | 12 Dec 2022 |
| Denial of Service Vulnerability in Protobuf Package: CVE-2022-3510 | 7.5 high | No fix published | 12 Dec 2022 |
| Denial of Service Vulnerability in Protobuf Package: CVE-2022-3171 | 7.5 high | No fix published | 12 Oct 2022 |
| Denial of Service Vulnerability in Protobuf Package: CVE-2025-4565 | 5.3 medium | No fix published | 16 Jun 2025 |
| Critical Vulnerability in Protobuf Package: CVE-2026-6409 | N/A unrated | No fix published | 16 Apr 2026 |
| Heap-Based Buffer Overflow in Protobuf Package | N/A unrated | No fix published | 25 Sep 2017 |
| Critical Vulnerability in Protobuf Package: CVE-2026-0994 | N/A unrated | No fix published | 30 Nov -0001 |
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Questions
About protobuf 3.21.9-4
Is protobuf 3.21.9-4 vulnerable?
Yes. 9 vulnerabilities in the Vulert database cover protobuf 3.21.9-4: 0 critical, 5 high, 1 medium and 0 low, plus 3 not yet rated. Each entry above names the fixed version to move to.
How do I monitor protobuf for upcoming vulnerabilities?
Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the protobuf version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.