Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows…
Priority HIGH 70CWE-327Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-327.
Summary
Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows attackers to execute a man-in-the-middle attack via intercepted and crafted responses.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00588 48th percentileScored 2026-11-07
Fix Fixed github.com/bishopfox/sliver (Go): 1.5.40
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | github.com/bishopfox/sliver (Go) | 1.5.0 to before 1.5.40 | 1.5.40 | Patch available | GHSA-8jxm-xp43-qh3q |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- github.com/bishopfox/sliver (Go) Vendor— Affected 1.5.0 to before 1.5.40 Fixed in 1.5.40 Patch available GHSA-8jxm-xp43-qh3q
Remediation
- Fix · GHSA-8jxm-xp43-qh3q github.com/bishopfox/sliver (Go) Fixed in 1.5.40 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-34758
- 2026-10-03 Alias added: GHSA-8jxm-xp43-qh3q
References
Advisory 4
Other 8
- https://github.com/tangent65536/Slivjacker
- https://github.com/BishopFox/sliver/releases/tag/v1.5.40
- https://github.com/BishopFox/sliver/security/advisories/GHSA-8jxm-xp43-qh3q
- https://github.com/BishopFox/sliver/commit/2d1ea6192cac2ff9d6450b2d96043fdbf8561516
- https://github.com/BishopFox/sliver
- https://github.com/BishopFox/sliver/blob/master/implant/sliver/cryptography/crypto.go
- https://github.com/BishopFox/sliver/blob/master/implant/sliver/cryptography/implant.go
- https://pkg.go.dev/vuln/GO-2023-1866
More BishopFox Sliver vulnerabilities
- TI-2025-19960 Server-Side Request Forgery (SSRF) in sliver teamserver CVSS 4.0MEDIUM 6.9
- TI-2026-26522 Sliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP Interface CVSS 4.0MEDIUM 5.9
- TI-2026-25389 Sliver Vulnerable to Authenticated OOM via Memory Exhaustion in mTLS/WireGuard Transports CVSS 4.0MEDIUM 5.7
- TI-2026-23367 Sliver: Authenticated Nil-Pointer Dereference in Handlers CVSS 4.0LOW 2.1
- TI-2026-20855 Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service CVSS 3.1HIGH 7.5
- TI-2026-20827 Website Path Traversal / Arbitrary File Read (Authenticated) in Sliver CVSS 3.1MEDIUM 6.5
Sources
- CVE-2023-34758 · CVE Program
- CVE-2023-34758 · NVD
- FIRST EPSS
- GHSA-8jxm-xp43-qh3q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences