CVE-2020-13598Public exploit

Memory corruption via undersized FAT filename buffer

Published May 24, 2021 · Updated Sep 17, 2024

Stack buffer overflow in Zephyr RTOS 1.14.2 and 2.3.0 allows local users to corrupt memory through a long FAT filename. The fatfs_stat function uses strcpy to place a long-name result into fs_dirent.name, while MAX_FILE_NAME remains sized for a 12-character 8.3 name. The flaw is reachable only when FAT long-file-name support is enabled and an application calls fs_stat on a filename longer than 12 characters; protected builds abort, while unprotected builds suffer memory corruption.

CVSS severity6.3
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Zephyr RTOS 1.14.2 and 2.3.0 allows local users to corrupt memory through a long FAT filename. The fatfs_stat function uses strcpy to place a long-name result into fs_dirent.name, while MAX_FILE_NAME remains sized for a 12-character 8.3 name. The flaw is reachable only when FAT long-file-name support is enabled and an application calls fs_stat on a filename longer than 12 characters; protected builds abort, while unprotected builds suffer memory corruption.

The record

CVE
CVE-2020-13598
Published
May 24, 2021
Updated
Sep 17, 2024
Vendor
Zephyr Project
Product
Zephyr RTOS
Classifications
CWE-121, CWE-787
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 24, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=v1.14.2 <unspecified
  2. Affected versionversion=v2.3.0 <unspecified

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Zephyr Project · Zephyr RTOSversion=v1.14.2 <unspecified; version=v2.3.0 <unspecified

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.3Zephyr ProjectCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write

Public exploit references

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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