Medium severity · published Jul 25, 2023
CVE-2023-35942
Envoy is an open source edge and service proxy designed for cloud-native applications
6.5
CVSS
0.9%
EPSS
No
On KEV
Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, gRPC access loggers using listener's global scope can cause a `use-after-free` crash when the listener is drained. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. As a workaround, disable gRPC access log or stop listener update.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EN
Envoy · Envoyproxy
1.23.0 before 1.23.12; 1.24.0 before 1.24.10; 1.25.0 before 1.25.9; 1.26.0 before 1.26.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-35942
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-35942
Exploit
https://github.com/envoyproxy/envoy/security/advisories/GHSA-69vr-g55c-v2v4
More from Envoy
9.8
CVE-2026-111497
Out-of-Bounds Write in Google Brotli Decoder
7.5
CVE-2023-44487
HTTP/2 Rapid Reset Attack Vulnerability
10.0
CVE-2019-9901
Envoy 1.9.0 and before does not normalize HTTP URL paths
9.8
CVE-2023-35941
Envoy is an open source edge and service proxy designed for cloud-native applications
9.8
CVE-2023-27488
Envoy is an open source edge and service proxy designed for cloud-native applications