Security readout for executives and security teams
Plain-English summary
This Envoy flaw can let a highly positioned attacker crash the proxy, causing service disruption. The attacker must control both an upstream host and the service discovery data for that host, so exposure is narrower than a typical internet-facing bug. The vendor fixed it in Envoy 1.22.1; disabling gRPC health checks is the stated workaround.
Executive priority
Treat as a targeted availability risk, not a broad compromise issue. Prioritize internet-facing or business-critical Envoy gateways where service discovery or upstream endpoints cross trust boundaries.
Technical view
Envoy versions before 1.22.1 can hit a null pointer dereference in GrpcHealthCheckerImpl. The crash condition involves gRPC upstream health checking plus retained service-discovery hosts. If the controlled host is removed from discovery and later fails gRPC health checking, Envoy may segfault. CVSS is 5.9 with high attack complexity.
Likely exposure
Most exposed environments are Envoy deployments before 1.22.1 using gRPC active health checks with service discovery such as DNS or EDS. Risk increases when upstream hosts or discovery inputs are controlled outside a trusted boundary.
Exploitation context
The source bundle does not report active exploitation, and CISA KEV status is false. Practical exploitation requires unusual control: both an upstream host and the service discovery path for that host.
Researcher notes
Evidence supports a denial-of-service condition only. The advisory describes a segmentation fault from CWE-476 in GrpcHealthCheckerImpl. No confidentiality or integrity impact is claimed, and no public exploitation is cited in the supplied sources.
Mitigation direction
- Upgrade Envoy to version 1.22.1 or later.
- If upgrading is delayed, disable gRPC health checking.
- Replace gRPC health checks with another supported health check type.
- Review vendor guidance before applying compensating controls.
Validation and detection
- Inventory Envoy versions and flag any deployment before 1.22.1.
- Identify clusters configured with gRPC upstream health checks.
- Review service discovery sources for externally controlled upstream entries.
- Confirm upgraded instances no longer run affected Envoy versions.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-29224 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-m4j9-86g3-8f49CVE reference · x_refsource_CONFIRM
- https://github.com/envoyproxy/envoy/commit/9b1c3962172a972bc0359398af6daa3790bb59dbCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.