CVE-2023-31161: An Improper Input Validation vulnerability in the Schweitzer Engineering Laboratories Real-Time Automation Con

Q: How do I fix CVE-2023-31161?

sel-3350 firmware: upgrade to r150-v2; sel-3532 firmware: upgrade to r150-v2; sel-3555 firmware: upgrade to r150-v2. Exact commands for each OS are on this page.

Q: Is CVE-2023-31161 being exploited?

CVE-2023-31161 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-31161 affect?

CVE-2023-31161 affects sel-3350 firmware, sel-3532 firmware, sel-3555 firmware. Severity is medium (CVSS 5.9). An Improper Input Validation vulnerability in the Schweitzer Engineering Laboratories Real-Time Automation Controller (SEL RTAC) Web Interface could allow an authenticated remote attacker to use internal resources, allowing a variety of pot

Q: How urgent is CVE-2023-31161?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 5.9UPGRADEUPGRADEUPGRADE

CVE-2023-31161 is a medium-severity flaw (CVSS 5.9) affecting sel-3350 firmware, sel-3532 firmware, sel-3555 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Improper Input Validation vulnerability in the Schweitzer Engineering Laboratories Real-Time Automation Controller (SEL RTAC) Web Interface could allow an authenticated remote attacker to use internal resources, allowing a variety of potential effects. 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 score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-20
Published	2023-05-10
Last modified	2026-06-17

Publisher (CNA): Schweitzer Engineering Laboratories, Inc. · Vendor: selinc

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

Am I affected?

Timeline

2023-05-10 20:15 UTCPublished CVE record published
2026-06-17 05:56 UTCUpdated Record last modified

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-3532 firmware UPGRADE

Affected: >= r143-v0 and < r150-v2

Fixed in: r150-v2

Safe to downgrade to: a release before r143-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-3555 firmware UPGRADE

Affected: >= r143-v0 and < r150-v2

Fixed in: r150-v2

Safe to downgrade to: a release before r143-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-3560e firmware UPGRADE

Affected: >= r144-v2 and < r150-v2

Fixed in: r150-v2

Safe to downgrade to: a release before r144-v2

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-3560s firmware UPGRADE

Affected: >= r144-v2 and < r150-v2

Fixed in: r150-v2

Safe to downgrade to: a release before r144-v2

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-2023-31161?

sel-3350 firmware: upgrade to r150-v2; sel-3532 firmware: upgrade to r150-v2; sel-3555 firmware: upgrade to r150-v2. Exact commands for each OS are on this page.

Is CVE-2023-31161 being exploited?

CVE-2023-31161 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-2023-31161 affect?

CVE-2023-31161 affects sel-3350 firmware, sel-3532 firmware, sel-3555 firmware. Severity is medium (CVSS 5.9). An Improper Input Validation vulnerability in the Schweitzer Engineering Laboratories Real-Time Automation Controller (SEL RTAC) Web Interface could allow an authenticated remote attacker to use internal resources, allowing a variety of pot

How urgent is CVE-2023-31161?

Priority 32/100. No elevated risk signals yet.

Related CVEs

CVE-2023-31166 MEDIUM 4.1 UPGRADE UPGRADE An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the Schweit
CVE-2023-31165 MEDIUM 4.3 UPGRADE UPGRADE An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the
CVE-2023-31164 MEDIUM 4.3 UPGRADE UPGRADE An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the
CVE-2023-31163 MEDIUM 4.3 UPGRADE UPGRADE An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the
CVE-2023-31162 MEDIUM 4.8 UPGRADE UPGRADE An Improper Input Validation vulnerability in the Schweitzer Engineering Laboratories Real-Time Automation Con

References

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