CVE-2020-17440

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.45%

Third-Party Advisory cisa.gov Third-Party Advisory cert.org

Affected: n/a n/a

References

Link	Tags
https://www.kb.cert.org/vuls/id/815128	third party advisory us government resource
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01	third party advisory us government resource

Frequently Asked Questions

What is the severity of CVE-2020-17440?: CVE-2020-17440 has been scored as a high severity vulnerability.
How to fix CVE-2020-17440?: To fix CVE-2020-17440, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-17440 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2020-17440 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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