CVE-2020-23776

Name: CVE-2020-23776
Creator: NVD / NIST
Published: 2021-01-26T22:15:11.95+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.79%

Last modified Jun 17, 2026

CVE-2020-23776 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A SSRF vulnerability exists in Winmail 6.5 in app.php in the key parameter when HTTPS is on. An attacker can use this vulnerability to cause the server to send a request to a specific URL. EPSS estimates a 0.79% chance of exploitation in the next 30 days.

Description

A SSRF vulnerability exists in Winmail 6.5 in app.php in the key parameter when HTTPS is on. An attacker can use this vulnerability to cause the server to send a request to a specific URL. An attacker can modify the request header 'HOST' value to cause the server to send the request.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.79%

51.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Winmail Project	Winmail	6.5

References

https://github.com/zhonghaozhao/winmail/issues/3Exploit, Issue Tracking, Third Party Advisory
https://github.com/zhonghaozhao/winmail/issues/3Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Jan 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-23776?

How severe is CVE-2020-23776?

CVE-2020-23776 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.79% probability of exploitation in the next 30 days.

How do I fix CVE-2020-23776?

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-2020-23776?

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

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Source: NVD / NIST