CVE-2020-17440
CVE-2020-17440 is a high-severity vulnerability in Uip Project Uip with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 3% (85th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Uip Project Uip
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2020-17440?
- 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.
- How severe is CVE-2020-17440?
- CVE-2020-17440 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2020-17440 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-17440?
- CVE-2020-17440 affects Uip Project Uip. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-17440?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2020-17440 published?
- CVE-2020-17440 was published on 2020-12-11 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:uip_project:uip:1.0:*:*:*:*:*:*:*
More vulnerabilities in Uip Project Uip
- CVE-2020-17438 — Critical (CVSS 9.8): An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that reassembles fragmented…
- CVE-2020-17439 — High (CVSS 8.3): An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming DNS…
- CVE-2020-24334 — High (CVSS 8.2): The code that processes DNS responses in uIP through 1.0, as used in Contiki and Contiki-NG, does not check whether the…
- CVE-2020-17437 — High (CVSS 8.2): An 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…
- CVE-2020-24335 — High (CVSS 7.5): An issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG. Domain name parsing lacks bounds checks,…
- CVE-2020-13987 — High (CVSS 7.5): An issue was discovered in Contiki through 3.0. An Out-of-Bounds Read vulnerability exists in the uIP TCP/IP Stack…