CVE-2023-35943— Envoy vulnerable to CORS filter segfault when origin header is removed
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I. Basic Information for CVE-2023-35943
Vulnerability Information
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Vulnerability Title
Envoy vulnerable to CORS filter segfault when origin header is removed
Source: NVD (National Vulnerability Database)
Vulnerability 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, the CORS filter will segfault and crash Envoy when the `origin` header is removed and deleted between `decodeHeaders`and `encodeHeaders`. 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, do not remove the `origin` header in the Envoy configuration.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
Vulnerability Title
Envoy 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy存在资源管理错误漏洞，该漏洞源于CORS过滤器会段错误并使Envoy崩溃。
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-2023-35943
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|---|
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- https://github.com/envoyproxy/envoy/security/advisories/GHSA-mc6h-6j9x-v3gqx_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2023-35943
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-2023-35944 | 8.2 HIGH | Envoy vulnerable to incorrect handling of HTTP requests and responses with mixed case sche |
| CVE-2023-35942 | 6.5 MEDIUM | Envoy's gRPC access log crash caused by the listener draining |
IV. Related Vulnerabilities
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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
V. Comments for CVE-2023-35943
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