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CVE-2023-31166: An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the Schweit

26
Routine
MEDIUM 4.1UPGRADEUPGRADEUPGRADE

CVE-2023-31166 is a medium-severity flaw (CVSS 4.1) affecting sel-2241 rtac module firmware, sel-3350 firmware, sel-3505 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the Schweitzer Engineering Laboratories Real-Time Automation Controller (SEL RTAC) Web Interface could allow a remote authenticated attacker to create folders in arbitrary paths of the file system. See SEL Service Bulletin dated 2022-11-15 for more details.

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score4.1 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededLow
User interactionRequired
EPSS exploit chance0.6% (top 52%)
CISA exploited listNo
WeaknessCWE-22
Published2023-05-10
Last modified2026-06-17
Publisher (CNA): Schweitzer Engineering Laboratories, Inc. · Vendor: selinc

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

Am I affected?

Timeline

selinc sel-2241 rtac module firmware UPGRADE
Affected: >= r126-v0 and < r150-v2
Fixed in: r150-v2
Safe to downgrade to: a release before r126-v0
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.
selinc sel-3350 firmware UPGRADE
Affected: >= r148-v0 and < r150-v2
Fixed in: r150-v2
Safe to downgrade to: a release before r148-v0
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.
selinc sel-3505 firmware UPGRADE
Affected: >= r126-v0 and < r150-v2
Fixed in: r150-v2
Safe to downgrade to: a release before r126-v0
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.
selinc sel-3505-3 firmware UPGRADE
Affected: >= r132-v0 and < r150-v2
Fixed in: r150-v2
Safe to downgrade to: a release before r132-v0
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.
selinc sel-3530 firmware UPGRADE
Affected: >= r126-v0 and < r150-v2
Fixed in: r150-v2
Safe to downgrade to: a release before r126-v0
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.
selinc sel-3530-4 firmware UPGRADE
Affected: >= r126-v0 and < r150-v2
Fixed in: r150-v2
Safe to downgrade to: a release before r126-v0
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-2023-31166?

sel-2241 rtac module firmware: upgrade to r150-v2; sel-3350 firmware: upgrade to r150-v2; sel-3505 firmware: upgrade to r150-v2. Exact commands for each OS are on this page.

Is CVE-2023-31166 being exploited?

CVE-2023-31166 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-2023-31166 affect?

CVE-2023-31166 affects sel-2241 rtac module firmware, sel-3350 firmware, sel-3505 firmware. Severity is medium (CVSS 4.1). An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the Schweitzer Engineering Laboratories Real-Time Automation Controller (SEL RTAC) Web Interface could allow a remote authenticated attacker

How urgent is CVE-2023-31166?

Priority 26/100. No elevated risk signals yet.

Related CVEs

References

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