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Priority reviewHigh

CVE-2025-15467

OpenSSL OpenSSL, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support

Issue summary: Parsing CMS AuthEnvelopedData or EnvelopedData message with maliciously crafted AEAD parameters can trigger a stack buffer overflow. Impact summary: A stack buffer overflow may lead to a crash, causing Denial of Service, or potentially remote code execution. When parsing CMS (Auth)EnvelopedData structures that use AEAD ciphers such as AES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is copied into a fixed-size stack buffer without verifying that its length fits the destination. An attacker can supply a crafted CMS message with an oversized IV, causing a...

CVSS
8.8
EPSS
47.6%
98.7% percentile
CISA KEV
Not listed
Published
2026.01.28
PRIORITY ASSESSMENT

Priority review

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV
Exploit probability47.6%
Technical severityCVSS 8.8

Vulnerability overview

Issue summary: Parsing CMS AuthEnvelopedData or EnvelopedData message with maliciously crafted AEAD parameters can trigger a stack buffer overflow. Impact summary: A stack buffer overflow may lead to a crash, causing Denial of Service, or potentially remote code execution. When parsing CMS (Auth)EnvelopedData structures that use AEAD ciphers such as AES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is copied into a fixed-size stack buffer without verifying that its length fits the destination. An attacker can supply a crafted CMS message with an oversized IV, causing a...

Affected product and versions

Product
OpenSSL OpenSSL, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support
Affected versions
>= 3.6.0 < 3.6.1, >= 3.5.0 < 3.5.5, >= 3.4.0 < 3.4.4, >= 3.3.0 < 3.3.6, >= 3.0.0 < 3.0.19, < V1.8.0, < V3.3.2, < V9.0 QU1, >= V4.0.700, < V17.9, < V17 Update 9, < V5.7 SP4, < V3.19 P024, < V3.20 P012, < V3.21 P02, < V21, < V3.1.13, < V3.2.4, >= V6.3, < V1.0 SP2 Update 5
Fixed versions
3.0.19, 3.3.6, 3.4.4, 3.5.5, 3.6.1

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that OpenSSL OpenSSL, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
CWE-120, CWE-787
CVE-2025-15467 — OpenSSL OpenSSL, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support | SECUFOCUS NOW