What’s Vulnerable › Vulnerabilities

CVE-2021-28682

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-20 · updated 2026-06-17
• Weakness: CWE-190

Description

An issue was discovered in Envoy through 1.71.1. There is a remotely exploitable integer overflow in which a very large grpc-timeout value leads to unexpected timeout calculations.

Affected products

• envoyproxy envoy: 1.14.6, 1.15.3, 1.16.2, 1.17.1

References

• https://blog.envoyproxy.io
• https://github.com/envoyproxy/envoy/blob/15e3b9dbcc9aaa9d391fa8033904aad1ea1ae70d/api/envoy/api/v2/cluster.proto#L36
• https://github.com/envoyproxy/envoy/releases
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-r22g-5f3x-xjgg
• https://blog.envoyproxy.io
• https://github.com/envoyproxy/envoy/blob/15e3b9dbcc9aaa9d391fa8033904aad1ea1ae70d/api/envoy/api/v2/cluster.proto#L36
• https://github.com/envoyproxy/envoy/releases

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