CVE-2020-26155: Multiple files and folders in Utimaco SecurityServer 4.20.0.4 and 4.31.1.0
40
This month
HIGH 7.8MITIGATEMITIGATEMITIGATE
CVE-2020-26155 is a high-severity flaw (CVSS 7.8) affecting block-safe firmware, cryptoserver cp5 firmware, cryptoserver cp5 vs-nfd firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Multiple files and folders in Utimaco SecurityServer 4.20.0.4 and 4.31.1.0. are installed with Read/Write permissions for authenticated users, which allows for binaries to be manipulated by non-administrator users. Additionally, entries are made to the PATH environment variable which, in conjunction with these weak permissions, could enable an attacker to perform a DLL hijacking attack.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
utimaco block-safe firmware MITIGATE
Affected: 2.0.0 · 3.0.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 2.0.0
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.
utimaco cryptoserver cp5 firmware MITIGATE
Affected: 5.0.0.0 · 5.1.0.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.0.0.0
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.
utimaco cryptoserver cp5 vs-nfd firmware MITIGATE
Affected: 5.1.0.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 5.1.0.0
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.
utimaco paymentserver firmware UPGRADE
Affected: >= 3.0 and <= 4.31.0
Fixed in: newer than 4.31.0
Safe to downgrade to: a release before 3.0
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.
utimaco paymentserver hybrid firmware UPGRADE
Affected: >= 3.0 and <= 4.33.0
Fixed in: newer than 4.33.0
Safe to downgrade to: a release before 3.0
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.
utimaco securityserver firmware UPGRADE
Affected: >= 3.0 and <= 4.31.1
Fixed in: newer than 4.31.1
Safe to downgrade to: a release before 3.0
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.
Verify at the official sourceNVD · 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-2020-26155?
block-safe firmware: mitigate or apply the listed mitigation; cryptoserver cp5 firmware: mitigate or apply the listed mitigation; cryptoserver cp5 vs-nfd firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2020-26155 being exploited?
CVE-2020-26155 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-2020-26155 affect?
CVE-2020-26155 affects block-safe firmware, cryptoserver cp5 firmware, cryptoserver cp5 vs-nfd firmware. Severity is high (CVSS 7.8). Multiple files and folders in Utimaco SecurityServer 4.20.0.4 and 4.31.1.0. are installed with Read/Write permissions for authenticated users, which allows for binaries to be manipulated by non-administrator users. Additionally, entries are
How urgent is CVE-2020-26155?
Priority 40/100. High severity; Public exploit reference
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