CVE-2025-27840
Published: 08 March 2025
Summary
CVE-2025-27840 is a medium-severity Hidden Functionality (CWE-912) vulnerability in Espressif Esp32 Firmware. Its CVSS base score is 6.8 (Medium).
Operationally, ranked in the top 31.1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-7816
Vulnerability details
Espressif ESP32 chips allow 29 hidden HCI commands, such as 0xFC02 (Write memory).
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Documenting every system component at the required granularity and reviewing the inventory detects or prevents hidden functionality from remaining undetected.
Recovery eliminates hidden functionality or backdoors introduced during compromise.
Policy requires supplier transparency and testing to detect hidden functionality or backdoors inserted in the supply chain.
Screening high-risk technical positions lowers the probability that hidden functionality or backdoors will be added by authorized personnel.
Hunting identifies hidden functionality used for persistence or evasion after initial compromise.
TSCM surveys discover and eliminate hidden surveillance functionality that would otherwise remain undetected in the environment.
Change control, approval gates, and flaw tracking force hidden functionality to be either documented or discovered and removed.
Vetting and integrity controls during acquisition reduce the likelihood of hidden backdoors or malicious functionality introduced by suppliers.