CVE-2021-36155

Name: CVE-2021-36155
Creator: NVD / NIST
Published: 2021-07-09T12:15:08.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.08%

Last modified Jun 17, 2026

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

7.5/10

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

EPSS Probability

2.08%

79.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

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: Jul 9, 2021
Last Modified: Jun 17, 2026
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.

Are you affected by CVE-2021-36155?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST