Security readout for executives and security teams
Plain-English summary
This CVE concerns TPM 2.0 specification revisions where a non-orderly shutdown can leave dictionary-attack protections improperly initialized. In business terms, some systems may have weaker protection for TPM-protected secrets after abnormal shutdown conditions. The issue is high severity, but the source data indicates local, high-privilege access and high attack complexity.
Executive priority
Treat as a high-priority firmware and platform assurance issue, especially for fleets relying on TPM-backed identity, disk encryption, or integrity controls. It is not presented as an internet-scale emergency, but unresolved vendor exposure should be tracked to closure.
Technical view
TCG TPM Library Family 2.0 revisions 1.38 through 1.59 have incorrect access control during non-orderly TPM shutdown using USE_DA_USED. Improper initialization may increase susceptibility to dictionary attacks. CVSS 3.1 is 7.2 with local access, high privileges, high complexity, changed scope, and high confidentiality and integrity impact.
Likely exposure
Exposure is limited to products implementing affected TCG TPM 2.0 Library specification revisions 1.38 through 1.59. The source bundle does not identify specific vendors, devices, firmware versions, operating systems, or CPEs, so asset-level exposure requires vendor confirmation.
Exploitation context
The bundle does not show CISA KEV status or cited active exploitation. The CVSS vector indicates exploitation is local, requires high privileges, has high complexity, and needs no user interaction. This is not described as remotely exploitable in the provided sources.
Researcher notes
The key gap is product mapping. NVD-style affected data is n/a, and the supplied bundle only names TCG specification revisions. Researchers should avoid assuming all TPM 2.0 devices are affected and should validate through vendor implementation statements and the TCG advisory.
Mitigation direction
- Check TCG advisory and device vendor guidance for affected TPM firmware or platform updates.
- Inventory systems with TPM 2.0 implementations and map firmware to vendor advisories.
- Prioritize abnormal-shutdown-sensitive systems protecting credentials, disk keys, or platform integrity secrets.
- Apply vendor-provided firmware, BIOS, or platform updates when explicitly available.
- Limit local administrative access on systems that may contain affected TPM implementations.
Validation and detection
- Confirm TPM vendor, firmware, and platform model for representative assets.
- Compare TPM implementation details against vendor advisories referencing CVE-2020-26933.
- Review whether systems rely on TPM-backed secrets for authentication or key protection.
- Check whether vendors identify affected specification revisions 1.38 through 1.59.
- Document systems where vendor impact or remediation status remains unknown.
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.
CVE-2020-26933 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
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AC:H/AV:L/A:N/C:H/I:H/PR:H/S:C/UI:N
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/AC:H/AV:L/A:N/C:H/I:H/PR:H/S:C/UI:N0.85.8Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AC:H/AV:L/A:N/C:H/I:H/PR:H/S:C/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://trustedcomputinggroup.org/about/security/CVE reference · x_refsource_MISC
- https://trustedcomputinggroup.org/wp-content/uploads/TCGVRT004-Advisory-FINAL.pdfCVE reference · x_refsource_CONFIRM
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.