CVE-2018-20578: An issue was discovered in NuttX before 7.27

Q: How do I fix CVE-2018-20578?

nuttx: upgrade to 7.27. Exact commands for each OS are on this page.

Q: Is CVE-2018-20578 being exploited?

CVE-2018-20578 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-20578 affect?

CVE-2018-20578 affects nuttx. Severity is high (CVSS 7.5). 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 Infinit

Q: How urgent is CVE-2018-20578?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2018-20578 is a high-severity flaw (CVSS 7.5) affecting nuttx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.6% (top 24%)
CISA exploited list	No
Weakness	CWE-835
Published	2018-12-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nuttx

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-12-28 18:29 UTCPublished CVE record published
2026-06-17 01:53 UTCUpdated Record last modified

nuttx nuttx UPGRADE

Affected: < 7.27

Fixed in: 7.27

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nuttx || rpm -q nuttx || nuttx --version

2. UPGRADE to 7.27 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nuttx

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nuttx

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-20578?

nuttx: upgrade to 7.27. Exact commands for each OS are on this page.

Is CVE-2018-20578 being exploited?

CVE-2018-20578 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-20578 affect?

CVE-2018-20578 affects nuttx. Severity is high (CVSS 7.5). 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 Infinit

How urgent is CVE-2018-20578?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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