CVE-2020-13482Public exploitNetwork attack vector

HTTPS traffic interception via missing hostname validation

Published May 25, 2020 · Updated Aug 4, 2024

Improper certificate validation in EM-HTTP-Request 1.1.5 allows man-in-the-middle attackers to read and alter HTTPS traffic. During ssl_handshake_completed in lib/em-http/http_connection.rb, the client accepts a TLS connection without comparing the certificate identity with the requested host. An attacker must intercept or redirect the connection and present a certificate that passes configured peer validation, enabling impersonation of the intended server and injection of response data.

CVSS severity7.4
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in EM-HTTP-Request 1.1.5 allows man-in-the-middle attackers to read and alter HTTPS traffic. During ssl_handshake_completed in lib/em-http/http_connection.rb, the client accepts a TLS connection without comparing the certificate identity with the requested host. An attacker must intercept or redirect the connection and present a certificate that passes configured peer validation, enabling impersonation of the intended server and injection of response data.

The record

CVE
CVE-2020-13482
Published
May 25, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-297, CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 25, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N
7.4NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-297Improper Validation of Certificate with Host Mismatch
CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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