CVE-2020-13645Network attack vector

TLS interception via skipped hostname verification

Published May 28, 2020 · Updated Aug 4, 2024

Improper certificate validation in GNOME glib-networking through 2.64.2 allows man-in-the-middle attackers to intercept TLS traffic. GTlsClientConnection treats a certificate as valid for any hostname when the calling application leaves server-identity unset, rather than failing the identity check. Exploitation requires a client application with that omission, such as affected Balsa releases, and a network position from which TLS traffic can be intercepted or altered.

CVSS severity6.5
Medium
EPSS probability1.97%
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 GNOME glib-networking through 2.64.2 allows man-in-the-middle attackers to intercept TLS traffic. GTlsClientConnection treats a certificate as valid for any hostname when the calling application leaves server-identity unset, rather than failing the identity check. Exploitation requires a client application with that omission, such as affected Balsa releases, and a network position from which TLS traffic can be intercepted or altered.

The record

CVE
CVE-2020-13645
Published
May 28, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 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

6.4NVDAV:N/AC:L/Au:N/C:P/I:P/A:N
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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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