Unauthenticated session hijacking and authentication bypass
Published Nov 30, 2023 · Updated Jun 3, 2025
Improper authentication in SEL-451 firmware allows remote attackers on an adjacent network to hijack sessions and bypass login. SEL has not published the affected authentication locus or the incorrect operation that accepts an unauthorized session. No credentials or user interaction are required, and exploitation grants the hijacked session's authority without reported confidentiality or availability impact.
Summary
What happened
Improper authentication in SEL-451 firmware allows remote attackers on an adjacent network to hijack sessions and bypass login. SEL has not published the affected authentication locus or the incorrect operation that accepts an unauthorized session. No credentials or user interaction are required, and exploitation grants the hijacked session's authority without reported confidentiality or availability impact.
The record
- CVE
- CVE-2023-34388
- Published
- Nov 30, 2023
- Updated
- Jun 3, 2025
- Vendor
- Schweitzer Engineering Laboratories
- Product
- SEL-451 Protection, Automation, and Bay Control System
- Classifications
- CWE-287, T1550
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 30, 2023CVE publishedPublication date reported by the CVE source.
- Jun 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=R315-V0 <R315-V4
- Affected versionversion=R316-V0 <R316-V4
- Affected versionversion=R317-V0 <R317-V4
- Affected versionversion=R318-V0 <R318-V5
- Affected versionversion=R320-V0 <R320-V3
- Affected versionversion=R321-V0 <R321-V3
- Affected versionversion=R322-V0 <R322-V3
- Affected versionversion=R323-V0 <R323-V5
- Affected versionversion=R324-V0 <R324-V4
- Affected versionversion=R325-V0 <R325-V3
- Affected versionversion=R326-V0 <R326-V1
- Affected versionversion=R327-V0 <R327-V1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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