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CVE-2023-34058: VMware Tools contains a SAML token signature bypass vulnerability. A malicious actor that has been granted Gu

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HIGH 7.1WATCHLISTUPGRADEMITIGATEUPGRADE

CVE-2023-34058 is a high-severity flaw (CVSS 7.1) affecting open vm tools, debian linux, tools. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

VMware Tools contains a SAML token signature bypass vulnerability. A malicious actor that has been granted Guest Operation Privileges https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-security/GUID-6A952214-0E5E-4CCF-9D2A-90948FF643EC.html  in a target virtual machine may be able to elevate their privileges if that target virtual machine has been assigned a more privileged Guest Alias https://vdc-download.vmware.com/vmwb-repository/dcr-publ

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.1 (High)
Attack vectorAdjacent network
Attack complexityHigh
Privileges neededLow
User interactionNone
EPSS exploit chance0.7% (top 47%)
CISA exploited listNo
WeaknessCWE-347
Published2023-10-27
Last modified2026-06-17
Publisher (CNA): VMware · Vendor: debian · fedoraproject · vmware

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

vmware open vm tools UPGRADE
Affected: >= 11.0.0 and <= 12.3.0
Fixed in: newer than 12.3.0
Safe to downgrade to: a release before 11.0.0
1. Check installed version
apt-cache policy open-vm-tools || rpm -q open-vm-tools || open-vm-tools --version
2. UPGRADE to newer than 12.3.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade open-vm-tools
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade open-vm-tools
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 11.0.0 (Debian / Ubuntu)
apt-cache madison open-vm-tools sudo apt install open-vm-tools=<VERSION_BEFORE_11.0.0> sudo apt-mark hold open-vm-tools
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list open-vm-tools sudo dnf downgrade open-vm-tools-<VERSION_BEFORE_11.0.0> sudo dnf versionlock add open-vm-tools
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.
debian debian linux MITIGATE
Affected: 10.0 · 11.0 · 12.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 10.0
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.
vmware tools UPGRADE
Affected: >= 10.3.0 and < 12.3.5
Fixed in: 12.3.5
Safe to downgrade to: a release before 10.3.0
1. Check installed version
apt-cache policy tools || rpm -q tools || tools --version
2. UPGRADE to 12.3.5 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade tools
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade tools
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 10.3.0 (Debian / Ubuntu)
apt-cache madison tools sudo apt install tools=<VERSION_BEFORE_10.3.0> sudo apt-mark hold tools
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list tools sudo dnf downgrade tools-<VERSION_BEFORE_10.3.0> sudo dnf versionlock add tools
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.
fedoraproject fedora MITIGATE
Affected: 37 · 38 · 39
Fixed in: no fixed release known
Safe to downgrade to: a release before 37
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-2023-34058?

open vm tools: upgrade to newer than 12.3.0; debian linux: mitigate or apply the listed mitigation; tools: upgrade to 12.3.5. Exact commands for each OS are on this page.

Is CVE-2023-34058 being exploited?

CVE-2023-34058 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-2023-34058 affect?

CVE-2023-34058 affects open vm tools, debian linux, tools. Severity is high (CVSS 7.1). VMware Tools contains a SAML token signature bypass vulnerability. A malicious actor that has been granted Guest Operation Privileges https://docs.vmware.com/en/VMware-vSphere/8.0/vsphere-security/GUID-6A952214-0E5E-4CCF-9D2A-90948FF643EC.

How urgent is CVE-2023-34058?

Priority 43/100. High severity; On your watchlist

Software pages

Debian vulnerabilities · VMware vulnerabilities

Related CVEs

References

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