CVE-2025-1673 Out of bounds read when calling crc16_ansi and strlen in dns_validate_msg
A malicious DNS packet can cause an out-of-bounds read in Zephyr RTOS, leading to a crash or incorrect computation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-1673?
CVE-2025-1673 is a high-severity memory corruption vulnerability in Zephyrproject Zephyr, published on 25 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A malicious or malformed DNS packet without a payload can cause an out-of-bounds read, resulting in a crash (denial of service) or an incorrect computation.
Weakness: CWE-125
Which versions are affected by CVE-2025-1673?
It affects 1 product.
Products include Zephyrproject Zephyr.
How do I fix CVE-2025-1673?
No fix has been published for CVE-2025-1673 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-1673 being exploited?
There is no known exploitation of CVE-2025-1673 in the wild and no public exploit code.
Other vulnerabilities in Zephyrproject Zephyr
- CVE-2026-5067 Out-of-bounds read/write in HTTP WebSocket upgrade via non-null-terminated Sec-WebSocket-Key
- CVE-2022-3806 Bluetooth HCI Error Handling Double Free
- CVE-2017-14199 Memory corruption in getaddrinfo
- CVE-2018-1000800 Null dereference in n/a
- CVE-2021-3329 DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer
Sources
Also known as GHSA-jjhx-rrh4-j8mx.