Cyber Resilience

CVE-2023-5992

Redhat Enterprise Linux 7.0 … 9.0

Public PoC
Published
31 January 2024
Modified
03 November 2025
Patch / advisory
View advisory
CVSS Score v3.1 5.6
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:L/A:L
EPSS Score 0.012 64th percentile
Risk Priority 47 floored blend · peak EPSS

Summary

CVE-2023-5992 is a medium-severity Observable Discrepancy (CWE-203) vulnerability in Redhat Enterprise Linux. Its CVSS base score is 5.6 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Account Discovery (T1087); ranked in the top 36% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to IA-6 (Authentication Feedback) and SI-11 (Error Handling) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

A vulnerability was found in OpenSC where PKCS#1 encryption padding removal is not implemented as side-channel resistant. This issue may result in the potential leak of private data.

CWE(s)
CWE-203

Related Threats

MITRE ATT&CK Enterprise Techniques

T1087 Account Discovery Discovery
Adversaries may attempt to get a listing of valid accounts, usernames, or email addresses on a system or within a compromised environment.
attack.mitre.org →
T1110 Brute Force Credential Access
Adversaries may use brute force techniques to gain access to accounts when passwords are unknown or when password hashes are obtained.
attack.mitre.org →
T1595 Active Scanning Reconnaissance
Adversaries may execute active reconnaissance scans to gather information that can be used during targeting.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-6240Same product: Redhat Enterprise Linux
CVE-2024-0564Same product: Redhat Enterprise Linux
CVE-2024-0914Same product: Redhat Enterprise Linux
CVE-2023-50781Same product: Redhat Enterprise Linux
CVE-2024-0553Same product: Redhat Enterprise Linux
CVE-2023-50782Same product: Redhat Enterprise Linux
CVE-2023-0361Same product: Redhat Enterprise Linux
CVE-2026-25562Shared CWE-203
CVE-2024-21251Shared CWE-203
CVE-2023-26557Shared CWE-203

Affected Assets

opensc project
opensc
≤ 0.25.0
redhat
enterprise linux
7.0, 8.0, 9.0
redhat
enterprise linux eus
9.4
redhat
enterprise linux for arm 64
8.0_aarch64, 9.0_aarch64
redhat
enterprise linux for arm 64 eus
9.4_aarch64
redhat
enterprise linux for ibm z systems
8.0_s390x, 9.0_s390x
redhat
enterprise linux for ibm z systems eus
9.4_s390x
redhat
enterprise linux for power little endian
9.0_ppc64le
redhat
enterprise linux for power little endian eus
9.4_ppc64le
redhat
enterprise linux server aus
9.4
+1 more product configuration(s) — see NVD for full list

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 1 hardening rule · 1 OS baseline
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

IA-6 Authentication Feedback good match

Obscures authentication feedback so that success/failure differences are not observable to attackers.

SI-11 Error Handling good match

Requires error messages to avoid revealing exploitable details, directly stopping observable response discrepancies.

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.PS-06 mostly match
prevents

Secure SDLC practices directly prevent observable response discrepancies via consistent error handling and timing.

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.8.17 Clock synchronization none match
none

Accurate, synchronized timestamps reduce observable timing discrepancies that an attacker could exploit to infer sensitive information or distinguish between success and failure paths.

References