CVE-2021-36155
HIGHCVSS 7.5/10EPSS 2.08%
Last modified
CVE-2021-36155 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. LengthPrefixedMessageReader in gRPC Swift 1.1.0 and earlier allocates buffers of arbitrary length, which allows remote attackers to cause uncontrolled resource consumption and deny service.. EPSS estimates a 2.08% chance of exploitation in the next 30 days.
Description
LengthPrefixedMessageReader in gRPC Swift 1.1.0 and earlier allocates buffers of arbitrary length, which allows remote attackers to cause uncontrolled resource consumption and deny service.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linuxfoundation | Grpc Swift | 1.0.0 |
| Linuxfoundation | Grpc Swift | 1.1.0 |
| Linuxfoundation | Grpc Swift | 1.1.1 |
References
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35303Mailing List, Third Party Advisory
- https://github.com/grpc/grpc-swift/releasesRelease Notes, Third Party Advisory
- https://github.com/grpc/grpc-swift/security/advisories/GHSA-rxmj-hg9v-vp3pThird Party Advisory
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35303Mailing List, Third Party Advisory
- https://github.com/grpc/grpc-swift/releasesRelease Notes, Third Party Advisory
- https://github.com/grpc/grpc-swift/security/advisories/GHSA-rxmj-hg9v-vp3pThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-36155?
LengthPrefixedMessageReader in gRPC Swift 1.1.0 and earlier allocates buffers of arbitrary length, which allows remote attackers to cause uncontrolled resource consumption and deny service.
How severe is CVE-2021-36155?
CVE-2021-36155 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.08% probability of exploitation in the next 30 days.
How do I fix CVE-2021-36155?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-36155?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST