CVE-2023-34388: An Improper Authentication vulnerability in the Schweitzer Engineering Laboratories SEL-451 could allow a remo

Q: How do I fix CVE-2023-34388?

sel-451 firmware: upgrade to r315-v4, r316-v4, r317-v4, r318-v5, r320-v3, r321-v3, r322-v3, r323-v5, r324-v4, r325-v3. Exact commands for each OS are on this page.

Q: Is CVE-2023-34388 being exploited?

CVE-2023-34388 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-2023-34388 affect?

CVE-2023-34388 affects sel-451 firmware. Severity is medium (CVSS 6.5). An Improper Authentication vulnerability in the Schweitzer Engineering Laboratories SEL-451 could allow a remote unauthenticated attacker to potentially perform session hijacking attack and bypass authentication. See product Instruction

Q: How urgent is CVE-2023-34388?

Priority 38/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2023-34388 is a medium-severity flaw (CVSS 6.5) affecting sel-451 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Improper Authentication vulnerability in the Schweitzer Engineering Laboratories SEL-451 could allow a remote unauthenticated attacker to potentially perform session hijacking attack and bypass authentication. See product Instruction Manual Appendix A dated 20230830 for more details.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-287
Published	2023-11-30
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

2023-11-30 17:15 UTCPublished CVE record published
2026-06-17 06:03 UTCUpdated Record last modified

selinc sel-451 firmware UPGRADE

Affected: >= r315-v0 and < r315-v4 · >= r316-v0 and < r316-v4 · >= r317-v0 and < r317-v4 · >= r318-v0 and < r318-v5 · >= r320-v0 and < r320-v3 · >= r321-v0 and < r321-v3 · >= r322-v0 and < r322-v3 · >= r323-v0 and < r323-v5

Fixed in: r315-v4, r316-v4, r317-v4, r318-v5, r320-v3, r321-v3, r322-v3, r323-v5, r324-v4, r325-v3

Safe to downgrade to: a release before r315-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-2023-34388?

sel-451 firmware: upgrade to r315-v4, r316-v4, r317-v4, r318-v5, r320-v3, r321-v3, r322-v3, r323-v5, r324-v4, r325-v3. Exact commands for each OS are on this page.

Is CVE-2023-34388 being exploited?

CVE-2023-34388 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-2023-34388 affect?

CVE-2023-34388 affects sel-451 firmware. Severity is medium (CVSS 6.5). An Improper Authentication vulnerability in the Schweitzer Engineering Laboratories SEL-451 could allow a remote unauthenticated attacker to potentially perform session hijacking attack and bypass authentication. See product Instruction

How urgent is CVE-2023-34388?

Priority 38/100. No elevated risk signals yet.

Related CVEs

CVE-2023-34390 MEDIUM 4.5 UPGRADE An input validation vulnerability in the Schweitzer Engineering Laboratories SEL-451 could allow a remote auth
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CVE-2023-31177 MEDIUM 4.3 UPGRADE An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in the Schweitzer Eng
CVE-2023-31176 HIGH 7.5 UPGRADE An Insufficient Entropy vulnerability in the Schweitzer Engineering Laboratories SEL-451 could allow an unauth

References

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