CVE-2023-5779

Disclosure and service interruption via unchecked filter IDs

Published Feb 18, 2024 · Updated Aug 28, 2024

Out-of-bounds writes in Zephyr RTOS 3.5 and earlier allow local users to disclose data or cause a service interrupt via invalid CAN filter IDs. Multiple CAN remove_rx_filter implementations use an unchecked negative or oversized filter ID to index allocation bitmaps and callback arrays. Reachability requires low-privileged local code to pass an invalid ID to an enabled affected CAN driver; the disclosed impact is limited data exposure or service interruption.

CVSS severity4.4
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds writes in Zephyr RTOS 3.5 and earlier allow local users to disclose data or cause a service interrupt via invalid CAN filter IDs. Multiple CAN remove_rx_filter implementations use an unchecked negative or oversized filter ID to index allocation bitmaps and callback arrays. Reachability requires low-privileged local code to pass an invalid ID to an enabled affected CAN driver; the disclosed impact is limited data exposure or service interruption.

The record

CVE
CVE-2023-5779
Published
Feb 18, 2024
Updated
Aug 28, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2024Record 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.

  1. Affected versionversion=* <=3.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zephyr Project · Zephyr RTOSversion=* <=3.5

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.4Zephyr ProjectCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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