Vulnerability Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Envoy allows mixed-case schemes in HTTP/2, however, some internal scheme checks are case-sensitive. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, this can lead to the rejection of requests with mixed-case schemes such as `htTp` or `htTps`, or the bypassing of some requests such as `https` in unencrypted connections. With a fix in versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, Envoy will now lowercase scheme values by default, and change the internal scheme checks that were case-sensitive to be case-insensitive. There are no known workarounds for this issue.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Envoyproxy | Envoy | >= 1.23.0, < 1.23.12 |
Related Weaknesses (CWE)
References
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-pvgm-7jpg-pw5gExploitThird Party Advisory
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-pvgm-7jpg-pw5gExploitThird Party Advisory
FAQ
What is CVE-2023-35944?
CVE-2023-35944 is a vulnerability with a CVSS score of 8.2 (HIGH). Envoy is an open source edge and service proxy designed for cloud-native applications. Envoy allows mixed-case schemes in HTTP/2, however, some internal scheme checks are case-sensitive. Prior to vers...
How severe is CVE-2023-35944?
CVE-2023-35944 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-35944?
Check the references section above for vendor advisories and patch information. Affected products include: Envoyproxy Envoy.