CVE-2020-12141

Name: CVE-2020-12141
Creator: NVD / NIST
Published: 2021-10-19T16:15:07.613+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.52%

Last modified Jun 17, 2026

CVE-2020-12141 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. An out-of-bounds read in the SNMP stack in Contiki-NG 4.4 and earlier allows an attacker to cause a denial of service and potentially disclose information via crafted SNMP packets to snmp_ber_decode_string_len_buffer in os/net/app-layer/snmp/snmp-ber.c.. EPSS estimates a 1.52% chance of exploitation in the next 30 days.

Description

An out-of-bounds read in the SNMP stack in Contiki-NG 4.4 and earlier allows an attacker to cause a denial of service and potentially disclose information via crafted SNMP packets to snmp_ber_decode_string_len_buffer in os/net/app-layer/snmp/snmp-ber.c.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

1.52%

71.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Contiki-Ng	Contiki-Ng	<= 4.4

References

https://github.com/contiki-ng/contiki-ng/commit/12c824386ab60de757de5001974d73b32e19ad71#diff-32367fad664c6118fd5dda77cdf38eedc006cdd7544eca5bbeebe0b99653f8a0Patch, Third Party Advisory
https://github.com/contiki-ng/contiki-ng/pull/1355Patch, Third Party Advisory
https://twitter.com/ScepticCtfThird Party Advisory
https://github.com/contiki-ng/contiki-ng/commit/12c824386ab60de757de5001974d73b32e19ad71#diff-32367fad664c6118fd5dda77cdf38eedc006cdd7544eca5bbeebe0b99653f8a0Patch, Third Party Advisory
https://github.com/contiki-ng/contiki-ng/pull/1355Patch, Third Party Advisory
https://twitter.com/ScepticCtfThird Party Advisory

Timeline

Published: Oct 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12141?

How severe is CVE-2020-12141?

CVE-2020-12141 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.52% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12141?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-12141?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST