CVE-2020-12637

Name: CVE-2020-12637
Creator: NVD / NIST
Published: 2020-05-09T17:15:11.613+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.68%

Last modified Jun 17, 2026

CVE-2020-12637 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Zulip Desktop before 5.2.0 has Missing SSL Certificate Validation because all validation was inadvertently disabled during an attempt to recognize the ignoreCerts option.. EPSS estimates a 0.68% chance of exploitation in the next 30 days.

Description

Zulip Desktop before 5.2.0 has Missing SSL Certificate Validation because all validation was inadvertently disabled during an attempt to recognize the ignoreCerts option.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.68%

47.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Zulipchat	Zulip Desktop	>= 0.5.10, < 5.2.0

References

https://blog.zulip.org/2020/05/06/zulip-desktop-5-2-0-security-release/Vendor Advisory
https://blog.zulip.org/2020/05/06/zulip-desktop-5-2-0-security-release/Vendor Advisory

Timeline

Published: May 9, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12637?

Zulip Desktop before 5.2.0 has Missing SSL Certificate Validation because all validation was inadvertently disabled during an attempt to recognize the ignoreCerts option.

How severe is CVE-2020-12637?

CVE-2020-12637 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.68% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12637?

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-2020-12637?

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

Scan your code now

Source: NVD / NIST