# ISC vulnerabilities & exploitation > As of 2026-10-05, Threadlinqs tracks 7 ISC CVEs, 0 in the CISA Known Exploited Vulnerabilities catalog, linked to 2 tracked threat campaigns. **Data as of:** 2026-10-05 ## Exploitation timeline Threadlinqs has recorded 7 ISC CVEs published between 2026-05-15 and 2026-07-15. 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-2026-11622](https://intel.threadlinqs.com/cve/CVE-2026-11622) — HIGH 7.5 · EPSS 0.5% · 2026-07-22 - [CVE-2026-5950](https://intel.threadlinqs.com/cve/CVE-2026-5950) — MEDIUM 5.3 · EPSS 0.1% · 2026-05-20 - [CVE-2026-3039](https://intel.threadlinqs.com/cve/CVE-2026-3039) — HIGH 7.5 · EPSS 0.1% · 2026-05-20 - [CVE-2026-5946](https://intel.threadlinqs.com/cve/CVE-2026-5946) — HIGH 7.5 · EPSS 0.1% · 2026-05-20 - [CVE-2026-5947](https://intel.threadlinqs.com/cve/CVE-2026-5947) — HIGH 7.5 · EPSS 0% · 2026-05-20 - [CVE-2026-3593](https://intel.threadlinqs.com/cve/CVE-2026-3593) — HIGH 7.4 · EPSS 0% · 2026-05-20 - [CVE-2026-3592](https://intel.threadlinqs.com/cve/CVE-2026-3592) — MEDIUM 5.3 · EPSS 0% · 2026-05-20 ## 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)](https://intel.threadlinqs.com/threat/TL-2026-2596) — HIGH — 2026-09-21 - [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)](https://intel.threadlinqs.com/threat/TL-2026-0599) — HIGH — 2026-05-27 ## 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](https://intel.threadlinqs.com/cve/CVE-2026-11622) (0.5%), [CVE-2026-5950](https://intel.threadlinqs.com/cve/CVE-2026-5950) (0.1%), [CVE-2026-3039](https://intel.threadlinqs.com/cve/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. Canonical: https://intel.threadlinqs.com/vendors/isc All vendors: https://intel.threadlinqs.com/vendors Full detection coverage and IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp