Cyber Resilience

CVE-2025-15323

Crypto Weakness in Tanium Tanos 1.8.3 – 1.8.3.0199

Crypto Weakness
Published
05 February 2026
Modified
10 February 2026
Patch / advisory
View advisory
CVSS Score v3.1 3.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS Score 0.0015 5th percentile
Risk Priority 15 floored blend · peak EPSS

Summary

CVE-2025-15323 is a low-severity Improper Certificate Validation (CWE-295) vulnerability in Tanium Tanos. Its CVSS base score is 3.7 (Low).

Operationally, ranked at the 5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SC-17 (Public Key Infrastructure Certificates) and IA-5 (Authenticator Management) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A07:2025 Authentication Failures

EU & UK References

Vulnerability Data

Tanium addressed an improper certificate validation vulnerability in Tanium Appliance.

CWE(s)
CWE-295

Related Threats

CVEs Like This One

CVE-2026-2605Same product: Tanium Tanos
CVE-2025-13225Same product: Tanium Tanos
CVE-2025-15311Same product: Tanium Tanos
CVE-2025-15312Same product: Tanium Tanos
CVE-2025-15321Same product: Tanium Tanos
CVE-2025-15333Same vendor: Tanium
CVE-2025-15310Same vendor: Tanium
CVE-2025-15336Same vendor: Tanium
CVE-2025-15316Same vendor: Tanium
CVE-2025-15331Same vendor: Tanium

Affected Assets

tanium
tanos
1.8.3 — 1.8.3.0199 · 1.8.4 — 1.8.4.0205 · 1.8.5 — 1.8.5.0236

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SC-17 Public Key Infrastructure Certificates
  • SC-8 Transmission Confidentiality and Integrity
  • IA-5 Authenticator Management
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 12 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

SC-17 Public Key Infrastructure Certificates good match
prevent

Directly requires proper issuance, validation, and management of PKI certificates, preventing the exact improper certificate validation flaw described in CWE-295.

SC-8 Transmission Confidentiality and Integrity partial match
prevent

Mandates cryptographic mechanisms that enforce transmission integrity and confidentiality, which fail when certificate validation is bypassed.

IA-5 Authenticator Management partial match
prevent

Requires secure management and validation of authenticators including certificates, directly addressing the root cause of failed certificate checks.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-03 mostly match
prevents

Certificate-based authentication of users/services/hardware directly depends on correct validation.

PR.DS-02 mostly match
prevents

Proper certificate validation is a core mechanism for protecting data-in-transit confidentiality and integrity.

PR.PS-06 mostly match
prevents

Secure development practices explicitly include implementing correct certificate validation logic.

ID.RA-09 partial match
prevents

Assessing authenticity/integrity of acquired software often relies on code-signing certificate validation.

PR.AA-04 partial match
prevents

Identity assertions conveyed via certificates require validation to be verified.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.24 Use of cryptography partial match
prevents

Requiring issuance and validation of public-key certificates under an approved policy reduces the chance that certificates with improper validation will be trusted.

Hardening callouts derived

Configuration rules from DISA STIG baselines that reduce the attack surface for weaknesses of the type cited by this CVE. Derived transitively via CVE→CWE→STIG over `controls_xwalks` (authoritative rows only).

Oracle Linux 8 (2 rules)
  • V-248574 YUM must be configured to prevent the installation of patches, service packs, device drivers, or OL 8 system components that have not been digitally signed using a certificate that is recognized and approved by the organization. via CWE-295
  • V-248575 OL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. via CWE-295
RHEL 7 (1 rule)
  • V-204447 The Red Hat Enterprise Linux operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. via CWE-295
RHEL 8 (2 rules)
  • V-230264 RHEL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. via CWE-295
  • V-230265 RHEL 8 must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization. via CWE-295

References