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CVE-2022-21655

Incorrect handling of internal redirects results in crash in Envoy

HIGH
7.5
CVSS Score
Published: February 22, 2022 at 10:40 PM UTC
Updated: June 17, 2026 at 04:26 AM UTC
1 product affected across 1 vendorEnvoy

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

Envoy is an open source edge and service proxy, designed for cloud-native applications. The envoy common router will segfault if an internal redirect selects a route configured with direct response or redirect actions. This will result in a denial of service. As a workaround turn off internal redirects if direct response entries are configured on the same listener.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Envoy· Envoyproxy
95%
v < 1.18.6v < 1.19.3v < 1.20.2v < 1.21.11.19.0 ≤ v < 1.19.31.20.0 ≤ v < 1.20.21.21.0 ≤ v < 1.21.1
Affected range stops below 1.18.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.19.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.20.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 1.21.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/envoyproxy/envoy/commit/177d608155ba8b11598b9bbf8240e90d8c350682
x_refsource_CONFIRMIssue TrackingThird Party Advisory
Source: [email protected]
https://github.com/envoyproxy/envoy/security/advisories/GHSA-7r5p-7fmh-jxpg

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-670

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