9.1

CVE-2021-21410: contiki-ng Out-of-bounds Read

CVSS: 9.1v3.1CriticalModified
Published 18-06-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-21410 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in contiki-ng. EPSS estimates a 1.23% chance of exploitation in the next 30 days, higher than 68.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (NVD)
EPSS score
1.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-06-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

Contiki-NG is an open-source, cross-platform operating system for Next-Generation IoT devices. An out-of-bounds read can be triggered by 6LoWPAN packets sent to devices running Contiki-NG 4.6 and prior. The IPv6 header decompression function (<code>uncompress_hdr_iphc</code>) does not perform proper boundary checks when reading from the packet buffer. Hence, it is possible to construct a compressed 6LoWPAN packet that will read more bytes than what is available from the packet buffer. As of time of publication, there is not a release with a patch available. Users can apply the patch for this vulnerability out-of-band as a workaround.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.23%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

0.00 pp

From 1.23% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Contiki-ng1 product

1 vendor · 1 product

References

2 links