CVE-2021-21281 : Contiki-NG is an open-source, cross-platform operating system for internet of things devices. A buffer overflow vulnerab

Contiki-NG is an open-source, cross-platform operating system for internet of things devices. A buffer overflow vulnerability exists in Contiki-NG versions prior to 4.6. After establishing a TCP socket using the tcp-socket library, it is possible for the remote end to send a packet with a data offset that is unvalidated. The problem has been patched in Contiki-NG 4.6. Users can apply the patch for this vulnerability out-of-band as a workaround.

Published 2021-06-18 21:15:08

Updated 2021-06-24 16:47:40

Source GitHub, Inc.

View at NVD, CVE.org

Vulnerability category: Overflow

Exploit prediction scoring system (EPSS) score for CVE-2021-21281

EPSS FAQ

0.28%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 68 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21281

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
7.0	HIGH	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H	2.2	4.7	GitHub, Inc.
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: Low Integrity: Low Availability: High

CWE ids for CVE-2021-21281

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.

Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-21281

https://github.com/contiki-ng/contiki-ng/security/advisories/GHSA-mc42-fqfr-h9fp

Buffer overflow due to unvalidated TCP data offset · Advisory · contiki-ng/contiki-ng · GitHub
Patch;Third Party Advisory
https://github.com/contiki-ng/contiki-ng/pull/1366

Verify the TCP data offset to avoid uip_len overflows. by nvt · Pull Request #1366 · contiki-ng/contiki-ng · GitHub
Patch;Third Party Advisory

Products affected by CVE-2021-21281

Contiki-ng » Contiki-ng
Versions before (<) 4.6
cpe:2.3:o:contiki-ng:contiki-ng:*:*:*:*:*:*:*:*
Matching versions

Vulnerability Details : CVE-2021-21281

Exploit prediction scoring system (EPSS) score for CVE-2021-21281

CVSS scores for CVE-2021-21281

CWE ids for CVE-2021-21281

References for CVE-2021-21281

Products affected by CVE-2021-21281