An integer buffer overflow in the Nginx webserver of ExpressVPN Router version 1 allows…
Priority MEDIUM 49CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An integer buffer overflow in the Nginx webserver of ExpressVPN Router version 1 allows remote attackers to obtain sensitive information when the server running as reverse proxy via specially crafted request.
Why it matters now
EPSS 0.16483 97th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:expressvpn:expressvpn:1.0:*:*:*:*:*:*:* | 1.0 | Vulnerable | Expressvpn |
- cpe:2.3:a:expressvpn:expressvpn:1.0:*:*:*:*:*:*:* Versions 1.0 Vulnerable ·Expressvpn
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-29238
- 2026-10-03 Alias added: GHSA-647h-v8f6-577g
References
Advisory 3
- https://bugcrowd.com/disclosures/4e8d5325-8e49-4ea3-962a-a088bbb73a3f/expressvpn-router-integer-buffer-overflow-server-info-disclosure-when-router-s-nginx-server-used-as-reverse-proxy-server
- http://ja1sharma.com/blog/2021/CVE-2020-29238/
- http://packetstormsecurity.com/files/162152/ExpressVPN-VPN-Router-1.0-Integer-Overflow.html
More Expressvpn vulnerabilities
- TI-2024-16926 ExpressVPN before 12.73.0 on Windows, when split tunneling is used, sends DNS requests… CVSS 3.1HIGH 7.5
- TI-2018-11046 An issue was discovered in ExpressVPN on Windows. CVSS 3.0HIGH 7.1
Sources
- CVE-2020-29238 · CVE Program
- CVE-2020-29238 · NVD
- FIRST EPSS
- GHSA-647h-v8f6-577g · GitHub Advisory Database · CC BY 4.0
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