CVE-2021-32066 - CVE House
Back to Database
Status published High CVE-2021-32066

An issue was discovered in Ruby through 2.6.7, 2.7.x through...

Vulnerability Description

An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Net::IMAP does not raise an exception when StartTLS fails with an an unknown response, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-32066

Credits & Attribution

No credits recorded in the NVD database.

References

More from ruby-lang

View All →
CVE-2025-27221
In the URI gem before 1.0.3 for Ruby, the URI...
Low 3.2
CVE-2025-27220
In the CGI gem before 0.4.2 for Ruby, a Regular...
Medium 4
CVE-2025-27219
In the CGI gem before 0.4.2 for Ruby, the CGI::Cookie.parse...
Medium 5.8
CVE-2022-28739
There is a buffer over-read in Ruby before 2.6.10, 2.7.x...
High 7.5
CVE-2022-28738
A double free was found in the Regexp compiler in...
Critical 9.8

Affected Vendor

Affected Software

ruby, jd edwards enterpriseone tools
Vulnerable Versions:
2.6.0, 2.7.0, 3.0.0, 0

Timeline

Official Publish: August 1st, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.