CVE-2023-35944— Envoy vulnerable to incorrect handling of HTTP requests and responses with mixed case schemes
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I. Basic Information for CVE-2023-35944
Vulnerability Information
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Vulnerability Title
Envoy vulnerable to incorrect handling of HTTP requests and responses with mixed case schemes
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Envoy 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy存在环境问题漏洞，该漏洞源于可以绕过某些请求，可能会导致使用混合大小写方案的请求被拒绝。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| envoyproxy | envoy | >= 1.26.0, < 1.26.4 | - |
II. Public POCs for CVE-2023-35944
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|---|
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- https://github.com/envoyproxy/envoy/security/advisories/GHSA-pvgm-7jpg-pw5gx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2023-35944
Same Patch Batch · envoyproxy · 2023-07-25 · 4 CVEs total
| CVE-2023-35941 | 8.6 HIGH | Envoy vulnerable to OAuth2 credentials exploit with permanent validity |
| CVE-2023-35942 | 6.5 MEDIUM | Envoy's gRPC access log crash caused by the listener draining |
| CVE-2023-35943 | 6.3 MEDIUM | Envoy vulnerable to CORS filter segfault when origin header is removed |
IV. Related Vulnerabilities
Same product: envoy
- CVE-2026-6994
Envoy Query Parameter header_mutation.cc params.add injectio - CVE-2026-26330
Envoy global rate limit may crash when the response phase li - CVE-2026-26311
Envoy HTTP: filter chain execution on reset streams causing - CVE-2026-26310
Crash for scoped ip address in Envoy during DNS - CVE-2026-26309
Envoy has an off-by-one write in JsonEscaper::escapeString()
Same vendor: envoyproxy
- CVE-2026-26330
Envoy global rate limit may crash when the response phase li - CVE-2026-26311
Envoy HTTP: filter chain execution on reset streams causing - CVE-2026-26310
Crash for scoped ip address in Envoy during DNS - CVE-2026-26309
Envoy has an off-by-one write in JsonEscaper::escapeString() - CVE-2026-26308
Envoy has an RBAC Header Validation Bypass via Multi-Value H
Same weakness: CWE-20
V. Comments for CVE-2023-35944
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