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Fencer Vulns
high 7.4

CVE-2020-13482 json

Improper Certificate Validation in EM-HTTP-Request

published 2020-05-25 6 y ago modified 2026-06-17 4 mo ago also GHSA-q27f-v3r6-9v77 , EUVD-2021-1157

cvss
7.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 60%
public exploits
0
none known

Summary

EM-HTTP-Request 1.1.5 uses the library eventmachine in an insecure way that allows an attacker to perform a man-in-the-middle attack against users of the library. The hostname in a TLS server certificate is not verified.

Patch / fix

  • rubygems em-http-request 1.1.6
  • rubygem-em-http-request openstack-optools 13 1.1.5-4.el7ost

red hat advisories RHSA-2021:0937

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-13482 updated cvss 7.4

rubygem-em-http-request: missing SSL hostname validation allows MITM

  • Red Hat OpenStack Platform 13.0 Operational Tools for RHEL 7 rubygem-em-http-request 1.1.5-4.el7ost
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.” RHSA-2021:0937

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/igrigorik/em-http-request/issues/339 referenced PoC, tagged "exploit" by a source, unverified
  • securitylab.github.com https://securitylab.github.com/advisories/GHSL-2020-094-igrigorik-em-http-request referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
rubygems em-http-request
<1.1.6
1.1.6

Classification

Weakness
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.