Exploitation timeline
Threadlinqs has recorded 9 OpenSSL CVEs published between and . The busiest month was 2026-06 (7 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 9 of 9 tracked OpenSSL CVEs.
- CVE-2025-15467high 8.8EPSS 52.4%
- CVE-2026-45447high 8.8EPSS 4%
- CVE-2026-34182critical 9.1EPSS 1.1%
- CVE-2026-34183high 7.5EPSS 1%
- CVE-2026-42764high 7.5EPSS 0.8%
- CVE-2026-45445high 7.5EPSS 0.7%
- CVE-2026-54876high 7.5EPSS 0.5%
- CVE-2026-42765high 7.5EPSS 0.5%
- CVE-2026-35188medium 5EPSS 0.2%
Products affected
Threadlinqs normalises CPE and CNA product records across all 9 CVEs; 1 distinct OpenSSL product is affected. The most frequently affected:
- OpenSSL 9 CVEs
Threat activity
4 tracked threat campaigns reference OpenSSL products or exploit OpenSSL CVEs:
- Microsoft September 2026 Patch Tuesday — 999 CVEs, 3 actively exploited zero-days (CVE-2026-85880, CVE-2026-81963, CVE-2026-85046)CRITICAL
- SDLC Supply Chain Attacks: ChainDrop npm Worm and Developer Pipeline TargetingHIGH
- CVE-2026-54876 — OpenSSL Client-Side Memory Leak in OCSP Response Checking (Denial of Service)HIGH
- HollowByte: OpenSSL Pre-Authentication TLS DoS Flaw Bloats Server Memory With 11-Byte PayloadMEDIUM
How to prioritise OpenSSL patching
This order follows the data Threadlinqs holds for OpenSSL, not a generic severity checklist:
- No OpenSSL CVE is in CISA KEV yet, so rank by exploit probability instead.
- Outside KEV, the highest EPSS scores are CVE-2025-15467 (52.4%), CVE-2026-45447 (4%), CVE-2026-34182 (1.1%).
- 1 CVE scores Critical and 7 High on CVSS v3 (maximum 9.1, average 7.7); sequence these after KEV and high-EPSS items.
- 2 CVEs have 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 2026-10-27 and refresh daily.