Unit 42's PEERSTITCH is a 1,344-byte payload living in the memory of two FortiOS processes. It never calls home. It reads markers out of traffic the firewall was already handling, and writes tags into the other daemon's memory.
1 article — 2026-10-16
NOT IN CISA KEV — CATALOG 2026.10.15
Authoritative record
Root Notes reports on this identifier; it does not maintain it. For the vendor advisory, the affected versions and the scoring, NVD and MITRE hold the primary records.
Not listed in CISA's Known Exploited Vulnerabilities catalog as of catalog 2026.10.15. That is not evidence it is not being exploited — the catalog records what CISA has confirmed, and identifiers have been attacked for days before appearing in it.
Unit 42's PEERSTITCH is a 1,344-byte payload living in the memory of two FortiOS processes. It never calls home. It reads markers out of traffic the firewall was already handling, and writes tags into the other daemon's memory.