Medium severity · published May 25, 2021
CVE-2020-13602
Remote Denial of Service in LwM2M do_write_op_tlv
5.5
CVSS
0.3%
EPSS
No
On KEV
Description
Remote Denial of Service in LwM2M do_write_op_tlv. Zephyr versions >= 1.14.2, >= 2.2.0 contain Improper Input Validation (CWE-20), Loop with Unreachable Exit Condition ('Infinite Loop') (CWE-835). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-g9mg-fj58-6fqh
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZE
Zephyr · Zephyrproject
through 1.14.2; 2.0.0 through 2.2.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13602
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-13602
Third Party Advisory
http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-g9mg-fj58-6fqh
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