Heap-based buffer overflow in OpenVPN ovpn-dco-win
Priority LOW 25CWE-122Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- Passive
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.
Summary
An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00338 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-11604
- 2026-10-03 Alias added: GHSA-f6c5-28vq-94w2
References
More OpenVPN Ovpn-dco-win vulnerabilities
- TI-2025-31967 Heap-based buffer overflow in OpenVPN ovpn-dco-win CVSS 3.1MEDIUM 5.5
- TI-2024-04824 NULL pointer dereference in OpenVPN ovpn-dco CVSS 3.1LOW 3.3
Sources
- CVE-2026-11604 · CVE Program
- CVE-2026-11604 · NVD
- FIRST EPSS
- GHSA-f6c5-28vq-94w2 · GitHub Advisory Database · CC BY 4.0
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