CVE-2023-34389Network attack vector

Indefinite service interruption via oversized firmware upload

Published Nov 30, 2023 · Updated Dec 2, 2024

Resource exhaustion in SEL-451 firmware allows remote authenticated users to disable the relay through an oversized HTTP firmware upload. The authenticated firmware-update handler accepts uploads of several gigabytes without the size restriction applied to FTP and disables the device when an upload starts. Privileged web access is required; while the upload remains in progress, physical buttons, output updates, and most network functionality remain unavailable.

CVSS severity4.5
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in SEL-451 firmware allows remote authenticated users to disable the relay through an oversized HTTP firmware upload. The authenticated firmware-update handler accepts uploads of several gigabytes without the size restriction applied to FTP and disables the device when an upload starts. Privileged web access is required; while the upload remains in progress, physical buttons, output updates, and most network functionality remain unavailable.

The record

CVE
CVE-2023-34389
Published
Nov 30, 2023
Updated
Dec 2, 2024
Vendor
Schweitzer Engineering Laboratories
Product
SEL-451 Protection, Automation, and Bay Control System
Classifications
CWE-770, CAPEC-469, T1499.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Nov 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=R315-V0 <R315-V4
  2. Affected versionversion=R316-V0 <R316-V4
  3. Affected versionversion=R317-V0 <R317-V4
  4. Affected versionversion=R318-V0 <R318-V5
  5. Affected versionversion=R320-V0 <R320-V3
  6. Affected versionversion=R321-V0 <R321-V3
  7. Affected versionversion=R322-V0 <R322-V3
  8. Affected versionversion=R323-V0 <R323-V5
  9. Affected versionversion=R324-V0 <R324-V4
  10. Affected versionversion=R325-V0 <R325-V3
  11. Affected versionversion=R326-V0 <R326-V1
  12. Affected versionversion=R327-V0 <R327-V1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Schweitzer Engineering Laboratories · SEL-451 Protection, Automation, and Bay Control Systemversion=R315-V0 <R315-V4; version=R316-V0 <R316-V4; version=R317-V0 <R317-V4; version=R318-V0 <R318-V5; version=R320-V0 <R320-V3; version=R321-V0 <R321-V3; version=R322-V0 <R322-V3; version=R323-V0 <R323-V5; version=R324-V0 <R324-V4; version=R325-V0 <R325-V3; version=R326-V0 <R326-V1; version=R327-V0 <R327-V1

Published CVSS scores

4.5Schweitzer Engineering LaboratoriesCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-469HTTP DoS
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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