CVE-2023-27491— Envoy forwards invalid Http2/Http3 downstream headers
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I. Basic Information for CVE-2023-27491
Vulnerability Information
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Vulnerability Title
Envoy forwards invalid Http2/Http3 downstream headers
Source: NVD (National Vulnerability Database)
Vulnerability Description
Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should reject malformed request lines. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, There is a possibility that non compliant HTTP/1 service may allow malformed requests, potentially leading to a bypass of security policies. This issue is fixed in versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/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，该漏洞源于不兼容的 HTTP/1 服务允许格式错误的请求，从而导致安全策略被绕过。以下是受影响的版本：1.26.0之前版本，1.25.3之前版本，1.24.4之前版本，1.23.6之前版本，1.22.9之前版本。
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 | >= 1.25.0, < 1.25.3 | - |
II. Public POCs for CVE-2023-27491
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2x_refsource_MISC
- https://datatracker.ietf.org/doc/html/rfc9113#section-8.3x_refsource_MISC
- https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1x_refsource_MISC
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rpx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2023-27491
Same Patch Batch · envoyproxy · 2023-04-04 · 6 CVEs total
| CVE-2023-27487 | 8.2 HIGH | Envoy client may fake the header `x-envoy-original-path` |
| CVE-2023-27493 | 8.1 HIGH | Envoy doesn't escape HTTP header values |
| CVE-2023-27496 | 6.5 MEDIUM | Envoy may crash when a redirect url without a state param is received in the oauth filter |
| CVE-2023-27488 | 5.4 MEDIUM | Envoy gRPC client produces invalid protobuf when an HTTP header with non-UTF8 value is rec |
| CVE-2023-27492 | 4.8 MEDIUM | Envoy may crash when a large request body is processed in Lua filter |
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-2023-27491
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