CVE-2025-2521 Lack of indexes’ validation against buffer borders leads to remote code execution.
Remote attackers can execute arbitrary code via buffer overread in Honeywell Experion PKS and OneWireless WDM Control Data Access components.
- 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-2025-2521?
CVE-2025-2521 is a high-severity memory corruption vulnerability in Honeywell C200E, published on 10 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Honeywell Experion PKS and OneWireless WDM contains a Memory Buffer vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to an Overread Buffers, which could result in improper index validation against buffer borders leading to remote code execution.
Honeywell recommends updating to the most recent version of Honeywell Experion PKS:
520.2 TCU9 HF1 and 530.1 TCU3 HF1 and OneWireless: 322.5 and 331.1.
The affected Experion PKS products are C300 PCNT02, C300 PCNT05, FIM4, FIM8, UOC, CN100, HCA, C300PM, and C200E. The Experion PKS versions affected are from 520.1 through 520.2 TCU9 and from 530 through 530 TCU3.The OneWireless WDM affected versions are 322.1 through 322.4 and 330.1 through 330.3.
Weakness: CWE-119
Which versions are affected by CVE-2025-2521?
How do I fix CVE-2025-2521?
No fix has been published for CVE-2025-2521 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-2025-2521 being exploited?
There is no known exploitation of CVE-2025-2521 in the wild and no public exploit code.
Sources
Also known as GHSA-jhch-7xr2-xm3c.