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Vulnerability record · CVE-2020-17440 · published 11 December 2020

CVE-2020-17440: Uip project uip vulnerability

Uip Project · Uip

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that domain names present in the DNS responses have '\0' termination. This results in errors when calculating the offset of the pointer that jumps over domain name bytes in DNS response packets when a name lacks this termination, and eventually leads to dereferencing the pointer at an invalid/arbitrary address, within newdata() and parse_name() in resolv.c.

7.5 CVSS 3.1 High EPSS 2.8% · top 14.1%
7.5CVSS 3.1 base score, v2 5.0
2.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that domain names present in the DNS responses have '\0' termination. This results in errors when calculating the offset of the pointer that jumps over domain name bytes in DNS response packets when a name lacks this termination, and eventually leads to dereferencing the pointer at an invalid/arbitrary address, within newdata() and parse_name() in resolv.c.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-17438Uip project uip out-of-bounds write vulnerabilityAn issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that reassembles fragmented packets fails to properly validat…EPSS 19%8.3CVE-2020-17439Uip project uip improper input validation vulnerabilityAn issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS packets does not validate that the i…EPSS 3.2%8.2CVE-2020-24334Uip project uip out-of-bounds read vulnerabilityThe 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…EPSS 2.4%8.2CVE-2020-17437Uip project uip out-of-bounds write vulnerabilityAn issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. When the Urgent flag is set in a TCP packet, and the stack is configur…EPSS 2.8%7.5CVE-2020-24335Uip project uip out-of-bounds read vulnerabilityAn issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG. Domain name parsing lacks bounds checks, allowing an attacker to corru…EPSS 3.0%7.5CVE-2020-13987Uip project uip out-of-bounds read vulnerabilityAn issue was discovered in Contiki through 3.0. An Out-of-Bounds Read vulnerability exists in the uIP TCP/IP Stack component when calculating the che…EPSS 3.3%

Source: NIST National Vulnerability Database (record CVE-2020-17440), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.