CVE-2020-24334

Name: CVE-2020-24334
Creator: NVD / NIST
Published: 2020-12-11T23:15:13.807+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.2/10EPSS 2.40%

Last modified Jun 17, 2026

CVE-2020-24334 is a high-severity vulnerability rated 8.2/10 on the CVSS scale. The code that processes DNS responses in uIP through 1.0, as used in Contiki and Contiki-NG, does not check whether the number of responses specified in the DNS packet header corresponds to the response data available in the DNS packet, leading to an out-of-bounds read and Denial-of-Service in resolv.c.. EPSS estimates a 2.40% chance of exploitation in the next 30 days.

Description

The code that processes DNS responses in uIP through 1.0, as used in Contiki and Contiki-NG, does not check whether the number of responses specified in the DNS packet header corresponds to the response data available in the DNS packet, leading to an out-of-bounds read and Denial-of-Service in resolv.c.

Metrics

CVSS 3.1

8.2/10

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

EPSS Probability

2.40%

82.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Uip Project	Uip	<= 1.0

References

https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory, US Government Resource
https://www.kb.cert.org/vuls/id/815128Third Party Advisory, US Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01Third Party Advisory, US Government Resource
https://www.kb.cert.org/vuls/id/815128Third Party Advisory, US Government Resource

Timeline

Published: Dec 11, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-24334?

How severe is CVE-2020-24334?

CVE-2020-24334 has a CVSS score of 8.2/10 (HIGH severity). The EPSS model estimates a 2.40% probability of exploitation in the next 30 days.

How do I fix CVE-2020-24334?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-24334?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST