CVE-2020-24338

Name: CVE-2020-24338
Creator: NVD / NIST
Published: 2020-12-11T23:15:13.98+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 35.94%

Last modified Jun 17, 2026

CVE-2020-24338 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in picoTCP through 1.7.0. The DNS domain name record decompression functionality in pico_dns_decompress_name() in pico_dns_common.c does not validate the compression pointer offset values with respect to the actual data present in a DNS response packet, causing out-of-bounds writes that lead to Denial-of-Service and Remote Code Execution.. EPSS estimates a 35.94% chance of exploitation in the next 30 days.

Description

An issue was discovered in picoTCP through 1.7.0. The DNS domain name record decompression functionality in pico_dns_decompress_name() in pico_dns_common.c does not validate the compression pointer offset values with respect to the actual data present in a DNS response packet, causing out-of-bounds writes that lead to Denial-of-Service and Remote Code Execution.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

35.94%

98.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Altran	Picotcp	<= 1.7.0

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-2020-24338?

How severe is CVE-2020-24338?

CVE-2020-24338 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 35.94% probability of exploitation in the next 30 days.

How do I fix CVE-2020-24338?

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-2020-24338?

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

Scan your code now

Source: NVD / NIST