CVE-2025-2520 Dereferencing of an uninitialized pointer leads to denial of service.
An attacker can cause a denial of service in Honeywell Experion PKS by exploiting an uninitialized pointer dereference in the EPA communications.
- 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-2025-2520?
CVE-2025-2520 is a high-severity vulnerability in Honeywell C300 PCNT02, 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 contains an Uninitialized Variable in the common Epic Platform Analyzer (EPA) communications. An attacker could potentially exploit this vulnerability, leading to a Communication Channel Manipulation, which results in a dereferencing of an uninitialized pointer leading to a denial of service.
Honeywell recommends updating to the most recent version of
Honeywell Experion PKS: 520.2 TCU9 HF1and 530.1 TCU3 HF1. The affected Experion PKS products are
C300 PCNT02, EHB, EHPM, ELMM, Classic ENIM, ETN, FIM4, FIM8, PGM, and RFIM. The Experion PKS versions affected are from 520.1 through 520.2 TCU9 and from 530 through 530 TCU3.
Weakness: CWE-457
Which versions are affected by CVE-2025-2520?
How do I fix CVE-2025-2520?
No fix has been published for CVE-2025-2520 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-2520 being exploited?
There is no known exploitation of CVE-2025-2520 in the wild and no public exploit code.
Sources
Also known as GHSA-235q-27q4-67jx.