What is CVE-2021-36155?

CVE-2021-36155 is a high-severity vulnerability in Linuxfoundation Grpc Swift, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2021-07-09.

How severe is CVE-2021-36155?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Linuxfoundation Grpc Swift

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.

Published 2021-07-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Linuxfoundation Grpc Swift — versions 1.0.0, 1.1.0, 1.1.1

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/grpc/grpc-swift/releases (Third Party Advisory, Release Notes)
bugs.chromium.org/p/oss-fuzz/issues/detail (Mailing List, Third Party Advisory)
github.com/grpc/grpc-swift/security/advisories/GHSA-rxmj-hg9v-vp3p (Third Party Advisory)

Frequently asked questions

What is CVE-2021-36155?: CVE-2021-36155 is a high-severity vulnerability in Linuxfoundation Grpc Swift, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2021-07-09.
How severe is CVE-2021-36155?: High severity. CVSS v3 base score is 7.5 out of 10.