CVE-2018-20579: Contiki-NG before 4.2 has a stack-based buffer overflow in the push function in os/lib/json/jsonparse.c that a

Routine

HIGH 7.1MITIGATE

CVE-2018-20579 is a high-severity flaw (CVSS 7.1) affecting contiki-ng. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Contiki-NG before 4.2 has a stack-based buffer overflow in the push function in os/lib/json/jsonparse.c that allows an out-of-bounds write of an '{' or '[' character.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-787
Published	2018-12-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: contiki-ng project

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

contiki-ng project contiki-ng MITIGATE

Affected: 4.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2018-20579?

contiki-ng: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-20579 being exploited?

CVE-2018-20579 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-2018-20579 affect?

CVE-2018-20579 affects contiki-ng. Severity is high (CVSS 7.1). Contiki-NG before 4.2 has a stack-based buffer overflow in the push function in os/lib/json/jsonparse.c that allows an out-of-bounds write of an '{' or '[' character.

How urgent is CVE-2018-20579?

Priority 31/100. High severity

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References

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