Exploitation timeline
Threadlinqs has recorded 5 netty CVEs published between and . The busiest month was 2026-07 (4 new CVEs). 1 of them (20%) are listed in CISA KEV, which means exploitation in the wild has been confirmed.
Most exploited vulnerabilities
Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 5 of 5 tracked netty CVEs.
- CVE-2023-44487high 7.5KEVEPSS 100%
- CVE-2026-56819high 7.5EPSS 0.6%
- CVE-2026-56817high 8.3EPSS 0.6%
- CVE-2026-59921medium 5.7EPSS 0.3%
- CVE-2026-56820high 7.4
Products affected
Threadlinqs normalises CPE and CNA product records across all 5 CVEs; 1 distinct netty product is affected. The most frequently affected:
- netty 5 CVEs
Threat activity
2 tracked threat campaigns reference netty products or exploit netty CVEs:
- Multiple Fortinet FortiOS Vulnerabilities (incl. CVE-2024-23113) Affect Siemens RUGGEDCOM APE1808 via Bundled Fortinet NGFW < V7.4.3 (SSA-832273)CRITICAL
- EtherHiding: Blockchain-Based C2 on Polygon Fuels ClickFix Backdoor + Banking-Trojan Extension Campaign Adopted by Criminal, North Korean, and Iran-Linked ActorsHIGH
How to prioritise netty patching
This order follows the data Threadlinqs holds for netty, not a generic severity checklist:
- 1 of 5 netty CVEs (20%) are in CISA KEV: treat them as actively exploited and remediate them first, starting with CVE-2023-44487.
- Outside KEV, the highest EPSS scores are CVE-2026-56819 (0.6%), CVE-2026-56817 (0.6%), CVE-2026-59921 (0.3%).
- 0 CVEs score Critical and 4 High on CVSS v3 (maximum 8.3, average 7.3); sequence these after KEV and high-EPSS items.
- 1 CVE has a public exploit or proof of concept recorded, which shortens the time from disclosure to attack.
About this data
Vendor attribution comes from the CNA and CPE product records of each CVE, folded to one vendor name; CVSS, EPSS and KEV status are read from the Threadlinqs CVE catalog; campaign and actor links come from tracked threat records. Counts reflect the data as of 2026-10-05 and refresh daily.