Vulnerability record · CVE-2020-29238 · published 10 March 2021

CVE-2020-29238: Expressvpn integer overflow vulnerability

Expressvpn · Expressvpn

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.

7.5 CVSS 3.1 High EPSS 16% · top 3.1% CWE-190 · Integer overflow

7.5CVSS 3.1 base score, v2 5.0

16%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References

9 Jul 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Expressvpn Expressvpn

References

Link	Tags
http://ja1sharma.com/blog/2021/CVE-2020-29238/	Third Party Advisory
http://packetstormsecurity.com/files/162152/ExpressVPN-VPN-Router-1.0-Integer-Overflow.html	Third Party AdvisoryVDB Entry
https://bugcrowd.com/disclosures/4e8d5325-8e49-4ea3-962a-a088bbb73a3f/expressvpn-router-integer-buffer-overflow-server-i	Third Party Advisory
http://ja1sharma.com/blog/2021/CVE-2020-29238/	Third Party Advisory
http://packetstormsecurity.com/files/162152/ExpressVPN-VPN-Router-1.0-Integer-Overflow.html	Third Party AdvisoryVDB Entry
https://bugcrowd.com/disclosures/4e8d5325-8e49-4ea3-962a-a088bbb73a3f/expressvpn-router-integer-buffer-overflow-server-i	Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-29238), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.