PatchTheCVECVE-2020-24334: The code that processes DNS responses in uIP through 1.0, as used in Contiki and Contiki-NG, does not check wh
CVE-2020-24334 is a high-severity flaw (CVSS 8.2) affecting uip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The 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 in the DNS packet header corresponds to the response data available in the DNS packet, leading to an out-of-bounds read and Denial-of-Service in resolv.c.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.2 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.4% (top 16%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2020-12-11 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-24334?
uip: upgrade to newer than 1.0. Exact commands for each OS are on this page.
Is CVE-2020-24334 being exploited?
CVE-2020-24334 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-24334 affect?
CVE-2020-24334 affects uip. Severity is 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 number of responses specified in the DNS packet header corresponds to the response data available in the DNS packet, lea
How urgent is CVE-2020-24334?
Priority 55/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2020-24335 HIGH 7.5 UPGRADE An issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG
- CVE-2020-17440 HIGH 7.5 DOWNGRADE An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products
- CVE-2020-17439 HIGH 8.3 DOWNGRADE An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products
- CVE-2020-17438 CRITICAL 9.8 DOWNGRADE An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products
- CVE-2020-17437 HIGH 8.2 UPGRADE UPGRADE An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products