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CVE-2020-13163

24
FAUCET Score

CVE-2020-13163 describes a critical vulnerability in em-imap 0.5, where the eventmachine library is used insecurely by failing to verify TLS server certificate hostnames. This flaw allows an unauthenticated attacker to conduct a Man-in-the-Middle (MitM) attack, leading to high confidentiality and integrity impacts. With a CVSS score of 7.4 (High), the attack complexity is high, but no user interaction is required. There is currently no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
0.5CPE matchmatch criteria
cpe:2.3:a:em-imap_project:em-imap:0.5:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.4HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.75%
Probability of exploitation in next 30 days
EPSS Percentile
51.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0075 is in the 20th percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

rubygemsGHSA-4f68-49qq-h392high

Improper certificate validation in em-imap

May 24, 2021

References

github.com / ConradIrwin/em-imap/issues/25
ExploitThird Party Advisory
securitylab.github.com / advisories/GHSL-2020-095-conradirwin-em-imap
ExploitThird Party Advisory