Exploitation timeline
Threadlinqs has recorded 7 ISC CVEs published between and . The busiest month was 2026-05 (6 new CVEs). None of them is listed in CISA KEV yet.
Most exploited vulnerabilities
Ranked with CISA KEV listings first, then EPSS exploit probability, then CVSS score. Showing 7 of 7 tracked ISC CVEs.
- CVE-2026-11622high 7.5EPSS 0.5%
- CVE-2026-5950medium 5.3EPSS 0.1%
- CVE-2026-3039high 7.5EPSS 0.1%
- CVE-2026-5946high 7.5EPSS 0.1%
- CVE-2026-5947high 7.5EPSS 0%
- CVE-2026-3593high 7.4EPSS 0%
- CVE-2026-3592medium 5.3EPSS 0%
Products affected
Threadlinqs normalises CPE and CNA product records across all 7 CVEs; 1 distinct ISC product is affected. The most frequently affected:
- BIND 9 7 CVEs
Threat activity
2 tracked threat campaigns reference ISC products or exploit ISC CVEs:
- F5 BIG-IP DNS Denial of Service via BIND DNSSEC Random Subdomain Attack (CVE-2026-11622)HIGH
- BIND 9 Multi-CVE Disclosure (May 2026) — Heap UAF in DoH (CVE-2026-3593), SIG(0) UAF (CVE-2026-5947), Resolver Resend Loop DoS (CVE-2026-5950), CLASS!=IN Assertion DoS (CVE-2026-5946), Glue Amplification (CVE-2026-3592), GSS-API TKEY Memory Exhaustion (CVE-2026-3039)HIGH
How to prioritise ISC patching
This order follows the data Threadlinqs holds for ISC, not a generic severity checklist:
- No ISC CVE is in CISA KEV yet, so rank by exploit probability instead.
- Outside KEV, the highest EPSS scores are CVE-2026-11622 (0.5%), CVE-2026-5950 (0.1%), CVE-2026-3039 (0.1%).
- 0 CVEs score Critical and 5 High on CVSS v3 (maximum 7.5, average 6.9); sequence these after KEV and high-EPSS items.
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.