CVE-2026-13479
LowCVSS 3.1Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
The LoRaWAN application-layer clock-synchronization service has an out-of-bounds read vulnerability in the AppTimeAns command handler. Missing length check causes up to 5 bytes to be read past the decrypted payload, potentially applying a garbage time correction.
Risk Assessment
The risk to the organization is low but real: a malicious or compromised network/application server (or session key holder) can affect the device's time estimate, potentially disrupting time-dependent applications. No data disclosure or crash, but time integrity is compromised.
Recommendation
Apply the fix that adds an explicit length check to drop too-short AppTimeAns frames. Update the system to a patched version.
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Original NVD description (English source)
The LoRaWAN application-layer clock-synchronization service parses downlinks in clock_sync_package_callback() (subsys/lorawan/services/clock_sync.c). Its command loop only guarantees that the one-byte command id is in bounds; for the CLOCK_SYNC_CMD_APP_TIME (AppTimeAns) command the handler then reads a 4-byte time correction via sys_get_le32() plus a 1-byte token without checking that 5 bytes remain in the receive buffer (len - rx_pos). A short or crafted AppTimeAns therefore reads up to 5 bytes past the end of the decrypted payload. The payload (rx_buf/len) is the decrypted application frame delivered to the registered downlink callback (mcps_indication->Buffer/BufferSize). Reaching the handler requires a frame on the clock-sync port that passes LoRaWAN's MAC integrity check and FRMPayload decryption, so the practical attacker is a malicious or compromised network/application server (the designated sender of AppTimeAns) or a party holding the session keys, rather than an arbitrary radio listener. The over-read is bounded: the backing store is a fixed 255-byte static buffer, so the few stray bytes do not fault, and the read values (time_correction, token) are used only internally and never transmitted, so there is no disclosure to the attacker and no crash. The sole effect is that a stale token matching ctx.req_token can apply a garbage time_correction to the device's own clock offset (ctx.time_offset), a minor integrity impact confined to the victim's time estimate. The fix adds an explicit length check that drops a too-short AppTimeAns. Note the sibling one-byte reads in the periodicity and force-resync handlers remain unguarded with the same negligible impact.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS