Medium severity · published Oct 12, 2021
CVE-2021-3322
Unexpected Pointer Aliasing in IEEE 802154 Fragment Reassembly in Zephyr
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
Unexpected Pointer Aliasing in IEEE 802154 Fragment Reassembly in Zephyr. Zephyr versions >= >=2.4.0 contain NULL Pointer Dereference (CWE-476). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p86r-gc4r-4mq3
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZE
Zephyr · Zephyrproject
2.4.0 before 2.5.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3322
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-3322
Exploit
http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p86r-gc4r-4mq3
More from Zephyr
10.0
CVE-2023-4260
Potential off-by-one buffer overflow vulnerability in the Zephyr fuse file system
9.8
CVE-2026-13214
Stack buffer overflow in OCPP GetConfiguration key parsing
9.8
CVE-2026-10666
Stack buffer overflow in `net_ipaddr_parse()` IPv4 address-with-port parsing in `subsys/net/ip/utils.c`
9.8
CVE-2026-5067
Out-of-bounds read/write in HTTP WebSocket upgrade via non-null-terminated Sec-WebSocket-Key
9.8
CVE-2026-1678
dns: memory‑safety issue in the DNS name parser