5.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
7.4 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
0.002 Low
EPSS
Percentile
64.5%
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.”
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 16.04 | noarch | ruby2.3 | < 2.3.1-2~ubuntu16.04.16+esm1 | UNKNOWN |
ubuntu | 18.04 | noarch | ruby2.5 | < 2.5.1-1ubuntu1.10 | UNKNOWN |
ubuntu | 20.04 | noarch | ruby2.7 | < 2.7.0-5ubuntu1.5 | UNKNOWN |
ubuntu | 20.10 | noarch | ruby2.7 | < 2.7.1-3ubuntu1.4 | UNKNOWN |
ubuntu | 21.04 | noarch | ruby2.7 | < 2.7.2-4ubuntu1.2 | UNKNOWN |
ubuntu | 21.10 | noarch | ruby2.7 | < 2.7.4-1ubuntu1 | UNKNOWN |
github.com/ruby/ruby/commit/a21a3b7d23704a01d34bd79d09dc37897e00922a (2.7)
launchpad.net/bugs/cve/CVE-2021-32066
nvd.nist.gov/vuln/detail/CVE-2021-32066
security-tracker.debian.org/tracker/CVE-2021-32066
ubuntu.com/security/notices/USN-5020-1
www.cve.org/CVERecord?id=CVE-2021-32066
www.ruby-lang.org/en/news/2021/07/07/starttls-stripping-in-net-imap/
5.8 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
7.4 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
0.002 Low
EPSS
Percentile
64.5%