8.3

CVE-2020-17439: uip_project uip Improper Input Validation

CVSS: 8.3v3.1HighModified
Published 11-12-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-17439 is a high (CVSS 8.3) Improper Input Validation vulnerability in uip_project uip. EPSS estimates a 3.18% chance of exploitation in the next 30 days, higher than 87.9% of scored vulnerabilities.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.3/10
010
High · v3.1 (NVD)
EPSS score
3.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 11-12-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

3.18%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

0.00 pp

From 3.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
3.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Uip_project1 product

1 vendor · 1 product

References

2 links