Buffer overflow in Contiki-Ng
CVE-2020-14936
Buffer overflows were discovered in Contiki-NG 4.4 through 4.5, in the SNMP agent. Functions parsing the OIDs in SNMP requests lack sufficient allocated target-buffer capacity verification when writing parsed OID values. The function snmp_oid_decode_oid() may overwrite memory areas beyond the provided target buffer, when called from snmp_message_decode() upon an SNMP request reception. Because the content of the write operations is externally provided in the SNMP requests, it enables a remote overwrite of an IoT device's memory regions beyond the allocated buffer. This overflow may allow remote overwrite of stack and statically allocated variables memory regions by sending a crafted SNMP request.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.014 (71.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- drive.google.com/file/d/1FypWH_g475jSL0mDFzquaATCeRIHQ2kj/view (Third Party Advisory)
- github.com/contiki-ng/contiki-ng/issues/1351 (Third Party Advisory)
Frequently asked questions
- What is CVE-2020-14936?
- CVE-2020-14936 is a critical-severity vulnerability in Contiki-Ng, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-08-18.
- How severe is CVE-2020-14936?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-14936 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.