Device hang via unsupported LwM2M TLV type
Published May 24, 2021 · Updated Sep 17, 2024
An infinite loop in Zephyr RTOS 1.14.2 and 2.2.0 allows remote attackers who can inject LwM2M messages to hang the device. In do_write_op_tlv, an unsupported TLV type receives no processing or error return, so the parser loop never advances or exits. Exploitation requires access to the privileged LwM2M protocol, which is not expected to be exposed to the internet, and interrupts device service.
Summary
What happened
An infinite loop in Zephyr RTOS 1.14.2 and 2.2.0 allows remote attackers who can inject LwM2M messages to hang the device. In do_write_op_tlv, an unsupported TLV type receives no processing or error return, so the parser loop never advances or exits. Exploitation requires access to the privileged LwM2M protocol, which is not expected to be exposed to the internet, and interrupts device service.
The record
- CVE
- CVE-2020-13602
- Published
- May 24, 2021
- Updated
- Sep 17, 2024
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-20, CWE-835, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 24, 2021CVE publishedPublication date reported by the CVE source.
- Sep 17, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.14.2 <unspecified
- Affected versionversion=2.2.0 <unspecified
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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