--- cve: "CVE-2025-15467" severity: "HIGH" cvss: 8.8 epss: "55.9%" vendor: "OpenSSL" kev: false exploited: false published: "2026-01-27 16:16:14" tags: [cve, security, high] source: tsecurity.de CVE-Dossier exported: "2026-10-24T04:00:47+02:00" --- # CVE-2025-15467 > 8.8 HIGH · 🧪 PoC ## Beschreibung 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 stack-based out-of-bounds write before any authentication or tag verification occurs. Applications and services that parse untrusted CMS or PKCS#7 content using AEAD ciphers (e.g., S/MIME (Auth)EnvelopedData with AES-GCM) are vulnerable. Because the overflow occurs prior to authentication, no valid key material is required to trigger it. While exploitability to remote code execution depends on platform and toolchain mitigations, the stack-based write primitive represents a severe risk. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the CMS implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue. OpenSSL 1.1.1 and 1.0.2 are not affected by this issue. ## CNA-Record (Kanon, cvelistV5) - CNA: **openssl** - State: PUBLISHED - Stand: 2026-10-15 01:02:38 ## CISA-Anreicherung (vulnrichment/ADP) - CISA-SSVC (Coordinator, v2.0.3): - Exploitation: **poc** - Automatable: **yes** - Technical Impact: **total** ## CVSS-Vektor ``` CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H ``` | Metrik | Wert | Bewertung | |---|---|---| | AV Angriffsvektor | Netzwerk | bad | | AC Komplexität | Gering | bad | | PR Privilegien | Keine | bad | | UI Interaktion | Erforderlich | good | | S Scope | Unverändert | good | | C Vertraulichkeit | Hoch | bad | | I Integrität | Hoch | bad | | A Verfügbarkeit | Hoch | bad | ## Schwachstellen-Klasse - **CWE-120** — Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. - **CWE-787** — Out-of-bounds Write The product writes data past the end, or before the beginning, of the intended buffer. ## Angriffsmuster (CAPEC) - [CAPEC-10 — Buffer Overflow via Environment Variables](https://capec.mitre.org/data/definitions/10.html) _(Severity: High)_ - [CAPEC-14 — Client-side Injection-induced Buffer Overflow](https://capec.mitre.org/data/definitions/14.html) _(Severity: High)_ - [CAPEC-24 — Filter Failure through Buffer Overflow](https://capec.mitre.org/data/definitions/24.html) _(Severity: High)_ - [CAPEC-42 — MIME Conversion](https://capec.mitre.org/data/definitions/42.html) _(Severity: High)_ - [CAPEC-44 — Overflow Binary Resource File](https://capec.mitre.org/data/definitions/44.html) _(Severity: Very High)_ - [CAPEC-45 — Buffer Overflow via Symbolic Links](https://capec.mitre.org/data/definitions/45.html) _(Severity: High)_ - [CAPEC-46 — Overflow Variables and Tags](https://capec.mitre.org/data/definitions/46.html) _(Severity: High)_ - [CAPEC-100 — Overflow Buffers](https://capec.mitre.org/data/definitions/100.html) _(Severity: Very High)_ ## Patch verfügbar (OSV) - a22063cd69a077cc68bb4c10e9f351f75899b194 (Commit) - 4601ff25acd6c2fe58a8bfe241e6c470e27b8074 (Commit) ## BSI-Hinweise (deutsch) - [IBM Security Verify Access: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-2253) — _BSI-Einstufung: hoch_ Ein Angreifer kann mehrere Schwachstellen in IBM Security Verify Access ausnutzen, um erweiterte Berechtigungen zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren, sensible Informationen offenzulegen und andere, nicht näher bezeichnete Angriffe durchzuführen. - [Oracle Communications Unified Assurance: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-1723) — _BSI-Einstufung: hoch_ Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications Unified Assurance ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden. - [Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-1730) — _BSI-Einstufung: mittel_ Ein Angreifer kann mehrere Schwachstellen in Xerox FreeFlow Print Server ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen. ## Referenzen - - - - - - - - - - - - --- _Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2025-15467/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_