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Vulnerability record · CVE-2020-1939 · published 12 May 2020

CVE-2020-1939: Apache nuttx null pointer dereference vulnerability

Apache · Nuttx

The Apache NuttX (Incubating) project provides an optional separate "apps" repository which contains various optional components and example programs. One of these, ftpd, had a NULL pointer dereference bug. The NuttX RTOS itself is not affected. Users of the optional apps repository are affected only if they have enabled ftpd. Versions 6.15 to 8.2 are affected.

9.8 CVSS 3.1 Critical EPSS 2.6% · top 15.5% CWE-476 · NULL pointer dereference
9.8CVSS 3.1 base score, v2 5.1
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

The Apache NuttX (Incubating) project provides an optional separate "apps" repository which contains various optional components and example programs. One of these, ftpd, had a NULL pointer dereference bug. The NuttX RTOS itself is not affected. Users of the optional apps repository are affected only if they have enabled ftpd. Versions 6.15 to 8.2 are affected.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.apache.org/thread.html/re3adc65ff4d8d9c34e5bccba3941a28cbb0a47191c150df2727e101d%40%3Cdev.nuttx.apache.org Mailing ListPatchThird Party Advisory
https://lists.apache.org/thread.html/re3adc65ff4d8d9c34e5bccba3941a28cbb0a47191c150df2727e101d%40%3Cdev.nuttx.apache.org Mailing ListPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-47868Apache nuttx heap-based buffer overflow vulnerabilityOut-of-bounds Write resulting in possible Heap-based Buffer Overflow vulnerability was discovered in tools/bdf-converter font conversion utility that…EPSS 0.74%9.8CVE-2025-47869Apache nuttx memory buffer overflow vulnerabilityImproper Restriction of Operations within the Bounds of a Memory Buffer vulnerability was discovered in Apache NuttX RTOS apps/exapmles/xmlrpc applic…EPSS 0.74%9.8CVE-2025-35003Apache nuttx memory buffer overflow vulnerabilityImproper Restriction of Operations within the Bounds of a Memory Buffer and Stack-based Buffer Overflow vulnerabilities were discovered in Apache Nut…EPSS 1.5%9.8CVE-2021-26461Apache nuttx integer overflow vulnerabilityApache Nuttx Versions prior to 10.1.0 are vulnerable to integer wrap-around in functions malloc, realloc and memalign. This improper memory assignmen…EPSS 5.0%9.8CVE-2020-17529Apache nuttx out-of-bounds write vulnerabilityOut-of-bounds Write vulnerability in TCP Stack of Apache NuttX (incubating) versions up to and including 9.1.0 and 10.0.0 allows attacker to corrupt …EPSS 2.9%9.1CVE-2020-17528Apache nuttx out-of-bounds write vulnerabilityOut-of-bounds Write vulnerability in TCP stack of Apache NuttX (incubating) versions up to and including 9.1.0 and 10.0.0 allows attacker to corrupt …EPSS 3.2%8.1CVE-2025-48769Apache nuttx use after free vulnerabilityUse After Free vulnerability was discovered in fs/vfs/fs_rename code of the Apache NuttX RTOS, that due recursive implementation and single buffer us…EPSS 1.6%6.5CVE-2025-48768Apache nuttx vulnerabilityRelease of Invalid Pointer or Reference vulnerability was discovered in fs/inode/fs_inoderemove code of the Apache NuttX RTOS that allowed root files…EPSS 0.79%

Source: NIST National Vulnerability Database (record CVE-2020-1939), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.