Vulnerability · Published Dec 11, 2020 · Assigned by mitre

CVE-2020-17439

High 8.3

In plain English

A high-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.2% (higher than 88% of all known vulnerabilities).

Severity (CVSS NVD)8.3High

Exploit odds (30 days)3.2%top 11.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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 the incoming DNS replies match outgoing DNS queries in newdata() in resolv.c. Also, arbitrary DNS replies are parsed if there was any outgoing DNS query with a transaction ID that matches the transaction ID of an incoming reply. Provided that the default DNS cache is quite small (only four records) and that the transaction ID has a very limited set of values that is quite easy to guess, this can lead to DNS cache poisoning.

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://www.kb.cert.org/vuls/id/815128 x_refsource_MISC
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01 x_refsource_MISC