7.5

CVE-2021-3320: zephyrproject-rtos zephyr NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
Published 24-05-2021Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-3320 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in zephyrproject-rtos zephyr. EPSS estimates a 0.85% chance of exploitation in the next 30 days, higher than 57.3% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.85%
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. 24-05-2021
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

Type Confusion in 802154 ACK Frames Handling. Zephyr versions >= v2.4.0 contain NULL Pointer Dereference (CWE-476). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-27r3-rxch-2hm7

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.85%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

0.00 pp

From 0.85% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.85%

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

Zephyrproject1 product
Zephyrproject-rtos1 product
  • zephyr≥ v2.4.0, < unspecified

2 vendors · 2 products

References

1 links