Published: 20/05/2021 Updated: 27/05/2021

CVSS v2 Base Score: 5 | Impact Score: 2.9 | Exploitability Score: 10

CVSS v3 Base Score: 7.5 | Impact Score: 3.6 | Exploitability Score: 3.9

VMScore: 445

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

An issue exists in Envoy up to and including 1.71.1. There is a remotely exploitable NULL pointer dereference and crash in TLS when an unknown TLS alert code is received.

Vulnerable Product	Search on Vulmon	Subscribe to Product
envoyproxy envoy 1.16.2
envoyproxy envoy 1.17.1

A NULL pointer dereference vulnerability was found envoyproxy/envoy This flaw allows an attacker to establish a TLS session that sends an invalid TLS alert code, causing a NULL pointer exception to occur that crashes the application, resulting in a denial of service The highest threat from this vulnerability is to system availability ...

Envoy before version 1180, and subsequently Istio before version 193, contains a remotely exploitable NULL pointer dereference and crash in TLS when an unknown TLS alert code is received ...

CWE-476 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/security/advisories/GHSA-xw4q-6pj2-5gfg https://nvd.nist.gov https://access.redhat.com/security/cve/cve-2021-28683

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CVE-2021-28683

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