Security readout for executives and security teams
Plain-English summary
CVE-2022-31045 affects Istio deployments where malformed HTTP headers can make Envoy behave unpredictably or crash. The main business concern is disruption to externally exposed ingress gateways, with limited confidentiality and integrity impact also scored. Vendor guidance says to upgrade; no workaround is identified in the provided sources.
Executive priority
Treat this as high priority for internet-facing Istio ingress. The issue can cause service disruption without authentication, and the vendor names upgrades as the fix. It is less urgent for isolated deployments, but exposure should be verified quickly.
Technical view
Affected Istio versions can pass ill-formed headers to Envoy in certain configurations, causing unexpected memory access, undefined behavior, or crashes. The CVSS 3.1 score is 7.0 with network attack vector, no privileges, no user interaction, high attack complexity, and high availability impact.
Likely exposure
Highest exposure is an Istio ingress Gateway reachable from external traffic. Internal-only mesh components may still matter where untrusted clients can reach affected Envoy/Istio paths. The source bundle does not define the exact risky configurations beyond “certain configurations.”
Exploitation context
The bundle marks KEV as false and provides no cited evidence of active exploitation. Exploitation is network-reachable and unauthenticated, but CVSS marks attack complexity high. Expected impact is mainly crash or undefined behavior rather than confirmed full compromise.
Researcher notes
The provided data has an apparent 1.12 branch inconsistency: the description says fixed in 1.12.8, while the affected list says versions before 1.12.18. Use vendor advisories as authoritative and validate installed versions directly.
Mitigation direction
- Upgrade Istio to 1.12.8, 1.13.5, 1.14.1, or later vendor-fixed releases.
- Prioritize externally exposed Istio ingress Gateways for emergency maintenance windows.
- Check Istio vendor guidance because the sources state no known workarounds.
- Inventory clusters running affected Istio branches before changing production routing.
Validation and detection
- Identify Istio versions deployed across clusters and compare against fixed versions.
- Confirm whether any Istio ingress Gateway is exposed to external traffic.
- Review gateway and proxy crash history around malformed-header handling symptoms.
- Track vendor advisories for clarification on affected 1.12 branch version ranges.
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
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2022-31045 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/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:L/I:L/A:H2.24.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/istio/istio/security/advisories/GHSA-xwx5-5c9g-x68xCVE reference · x_refsource_CONFIRM
- https://istio.io/latest/news/security/istio-security-2022-05CVE 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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.