CVE-2022-21656— X.509 subjectAltName matching bypass in Envoy
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I. Basic Information for CVE-2022-21656
Vulnerability Information
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Vulnerability Title
X.509 subjectAltName matching bypass in Envoy
Source: NVD (National Vulnerability Database)
Vulnerability Description
Envoy is an open source edge and service proxy, designed for cloud-native applications. The default_validator.cc implementation used to implement the default certificate validation routines has a "type confusion" bug when processing subjectAltNames. This processing allows, for example, an rfc822Name or uniformResourceIndicator to be authenticated as a domain name. This confusion allows for the bypassing of nameConstraints, as processed by the underlying OpenSSL/BoringSSL implementation, exposing the possibility of impersonation of arbitrary servers. As a result Envoy will trust upstream certificates that should not be trusted.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Envoy 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是一款开源的分布式代理服务器。 Envoy 存在信任管理问题漏洞，该漏洞源于用于实现默认证书验证例程的 default_validator.cc 实现在处理 subjectAltNames 时存在 type confusion 错误。
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 | < 1.20.2 | - |
II. Public POCs for CVE-2022-21656
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|---|
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- https://github.com/envoyproxy/envoy/security/advisories/GHSA-c9g7-xwcv-pjx2x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2022-21656
Same Patch Batch · envoyproxy · 2022-02-22 · 8 CVEs total
| CVE-2021-43826 | 7.5 HIGH | Crash when tunneling TCP over HTTP in Envoy |
| CVE-2022-21655 | 7.5 HIGH | Incorrect handling of internal redirects results in crash in Envoy |
| CVE-2021-43824 | 7.5 HIGH | Null pointer dereference in envoy |
| CVE-2022-21654 | 7.4 HIGH | Incorrect configuration handling allows TLS session re-use without re-validation in Envoy |
| CVE-2022-21657 | 6.8 MEDIUM | X.509 Extended Key Usage and Trust Purposes bypass in Envoy |
| CVE-2021-43825 | 6.1 MEDIUM | Use-after-free in Envoy |
| CVE-2022-23606 | 4.4 MEDIUM | Crash when a cluster is deleted in Envoy |
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-295
V. Comments for CVE-2022-21656
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