CVE-2020-24336
9.8
CRITICAL · CVSS 3.1 · EPSS 59.1% (pctl 99)
Patch early
EPSS 59.1% — above the 10% action threshold.
Description
An issue was discovered in Contiki through 3.0 and Contiki-NG through 4.5. The code for parsing Type A domain name answers in ip64-dns64.c doesn't verify whether the address in the answer's length is sane. Therefore, when copying an address of an arbitrary length, a buffer overflow can occur. This bug can be exploited whenever NAT64 is enabled.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 59.09% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-120 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2020-12-11 |
| Last modified | 2026-06-17 |
Affected (2)
| Vendor | Product |
|---|---|
| contiki-ng | contiki-ng |
| contiki-os | contiki |
References
→ the Explorer · watch your stack · NVD