What is CVE-2018-20578?

CVE-2018-20578 is a high-severity vulnerability in Nuttx, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2018-12-28.

How severe is CVE-2018-20578?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Nuttx

CVE-2018-20578

An issue was discovered in NuttX before 7.27. The function netlib_parsehttpurl() in apps/netutils/netlib/netlib_parsehttpurl.c mishandles URLs longer than hostlen bytes (in the webclient, this is set by default to 40), leading to an Infinite Loop. The attack vector is the Location header of an HTTP 3xx response.

Published 2018-12-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.016 (74.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Nuttx

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

bitbucket.org/nuttx/nuttx/issues/119/denial-of-service-infinite-loop-while (Exploit, Patch, Third Party Advisory)
bitbucket.org/nuttx/nuttx/downloads/nuttx-7_27-README.txt (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2018-20578?: CVE-2018-20578 is a high-severity vulnerability in Nuttx, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2018-12-28.
How severe is CVE-2018-20578?: High severity. CVSS v3 base score is 7.5 out of 10.