Security readout for executives and security teams
Plain-English summary
Keylime versions before 6.3.0 could let an unauthenticated network attacker trick an agent into resetting key material as if it were being re-added to a verifier. The published impact includes possible remote code execution, so systems using vulnerable Keylime agents should be treated as high business risk until updated or otherwise isolated.
Executive priority
Treat as urgent for any environment using Keylime. The combination of unauthenticated network access and possible remote code execution justifies expedited patching, especially for systems protecting trust, attestation, or sensitive workloads.
Technical view
The issue is described as CWE-290 authentication bypass by spoofing. A crafted request to the Keylime agent can reset U and V keys, recreating enrollment-like state. CVSS 3.1 is 9.8: network-accessible, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where Keylime agents older than 6.3.0 are reachable over a network, especially from untrusted segments. The provided sources do not identify specific downstream distributions, default exposure, or appliance packaging.
Exploitation context
The source bundle does not show CISA KEV listing or public evidence of active exploitation. The risk remains serious because the vulnerability is unauthenticated, network-reachable, and has published potential remote code execution impact.
Researcher notes
The affected state centers on agent handling of requests that reset U and V keys. Focus validation on version confirmation, agent exposure, trust-boundary assumptions, and evidence of unexpected enrollment-like behavior. Do not assume active exploitation without additional source evidence.
Mitigation direction
- Upgrade Keylime deployments to version 6.3.0 or later.
- Review the GitHub advisory for vendor-specific upgrade guidance.
- Restrict network access to Keylime agent interfaces.
- Prioritize internet-facing or broadly reachable agents first.
- Monitor vendor and distribution advisories for backported fixes.
Validation and detection
- Inventory all Keylime agent versions across managed hosts.
- Confirm no agents run versions older than 6.3.0.
- Review logs for unexpected re-addition or key reset activity.
- Validate agent interfaces are reachable only from trusted verifiers.
- Check vulnerability scanner results against actual installed Keylime 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-290: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-43310 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://seclists.org/oss-sec/2022/q1/101CVE reference · x_refsource_MISC
- https://github.com/keylime/keylime/security/advisories/GHSA-2m39-75g9-ff5rCVE 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.
Authentication Bypass by Spoofing
Authentication Bypass by Spoofing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.