CVE-2020-29238

Name: CVE-2020-29238
Creator: NVD / NIST
Published: 2021-03-10T03:15:12.32+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 16.65%

Last modified Jun 17, 2026

CVE-2020-29238 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 16.65% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

16.65%

96.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Expressvpn	Expressvpn	1.0

References

http://expressvpn.comVendor Advisory
http://ja1sharma.com/blog/2021/CVE-2020-29238/Third Party Advisory
http://packetstormsecurity.com/files/162152/ExpressVPN-VPN-Router-1.0-Integer-Overflow.htmlThird Party Advisory, VDB Entry
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-serverThird Party Advisory
http://expressvpn.comVendor Advisory
http://ja1sharma.com/blog/2021/CVE-2020-29238/Third Party Advisory
http://packetstormsecurity.com/files/162152/ExpressVPN-VPN-Router-1.0-Integer-Overflow.htmlThird Party Advisory, VDB Entry
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-serverThird Party Advisory

Timeline

Published: Mar 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-29238?

How severe is CVE-2020-29238?

CVE-2020-29238 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 16.65% probability of exploitation in the next 30 days.

How do I fix CVE-2020-29238?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-29238?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST