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CVE-2020-13645: In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verificatio

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MEDIUM 6.5REMOTEWATCHLISTUPGRADEUPGRADEMITIGATE

CVE-2020-13645 is a medium-severity flaw (CVSS 6.5) affecting balsa, glib-networking, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its intended documented behavior, to fail the certificate verification. Applications that fail to provide the server identity, including Balsa before 2.5.11 and 2.6.x before 2.6.1, accept a TLS certificate if the cert

Why this priority

  • Public exploit reference
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance2.0% (top 19%)
CISA exploited listNo
WeaknessCWE-295
Published2020-05-28
Last modified2026-06-17
Publisher (CNA): MITRE · Vendor: broadcom · canonical · fedoraproject · gnome · netapp

Share: LinkedIn · X · Reddit

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

gnome balsa UPGRADE
Affected: < 2.5.11 · 2.6.0
Fixed in: 2.5.11
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy balsa || rpm -q balsa || balsa --version
2. UPGRADE to 2.5.11 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade balsa
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade balsa
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
gnome glib-networking UPGRADE
Affected: < 2.62.4 · >= 2.64.0 and < 2.64.3
Fixed in: 2.62.4, 2.64.3
Safe to downgrade to: a release before 2.64.0
1. Check installed version
apt-cache policy glib-networking || rpm -q glib-networking || glib-networking --version
2. UPGRADE to 2.62.4 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade glib-networking
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade glib-networking
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 2.64.0 (Debian / Ubuntu)
apt-cache madison glib-networking sudo apt install glib-networking=<VERSION_BEFORE_2.64.0> sudo apt-mark hold glib-networking
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list glib-networking sudo dnf downgrade glib-networking-<VERSION_BEFORE_2.64.0> sudo dnf versionlock add glib-networking
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
canonical ubuntu linux MITIGATE
Affected: 16.04 · 18.04 · 19.10 · 20.04
Fixed in: no fixed release known
Safe to downgrade to: a release before 16.04
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fedoraproject fedora MITIGATE
Affected: 31 · 32
Fixed in: no fixed release known
Safe to downgrade to: a release before 31
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
netapp cloud backup MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy cloud-backup || rpm -q cloud-backup || cloud-backup --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
broadcom fabric operating system MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-13645?

balsa: upgrade to 2.5.11; glib-networking: upgrade to 2.62.4, 2.64.3; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-13645 being exploited?

CVE-2020-13645 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-13645 affect?

CVE-2020-13645 affects balsa, glib-networking, ubuntu linux. Severity is medium (CVSS 6.5). In GNOME glib-networking through 2.64.2, the implementation of GTlsClientConnection skips hostname verification of the server's TLS certificate if the application fails to specify the expected server identity. This is in contrast to its int

How urgent is CVE-2020-13645?

Priority 58/100. Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Ubuntu vulnerabilities

Related CVEs

References

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