# CVE-2016-4655 — Apple Iphone Os **CISA KEV** > As of 2025-10-21, CVE-2016-4655 is a MEDIUM-severity vulnerability in Apple Iphone Os, CVSS v3.1 5.5, EPSS 30.3% (98.0th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-05-24), with a US federal remediation deadline of 2022-06-14. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2016-4655, most recently “NSO Group Co-Founder Shalev Hulio Held Israeli Diplomatic Passport in Panama, Raising State-Ties Questions for Pegasus Spyware Vendor”. **Last updated:** 2025-10-21 ## What is CVE-2016-4655? The kernel in Apple iOS before 9.3.5 allows attackers to obtain sensitive information from memory via a crafted app. Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 3671 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 5.5 — MEDIUM (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`) - **EPSS (FIRST):** 30.3% probability of exploitation in the next 30 days, higher than 98.0% of all scored CVEs - **CISA KEV:** Listed since 2022-05-24, federal remediation deadline 2022-06-14 - **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9 - **Published:** 2016-08-25, last modified 2025-10-21 ## Is CVE-2016-4655 being exploited? CISA added CVE-2016-4655 to the Known Exploited Vulnerabilities catalog on 2022-05-24, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2022-06-14 under BOD 22-01. Weaponised exploit code for CVE-2016-4655 is publicly available. 4 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 43 in the Threadlinqs vulnerability feed. - [jndok/PegasusX](https://github.com/jndok/PegasusX) (github) - [Cryptiiiic/skybreak](https://github.com/Cryptiiiic/skybreak) (github) - [liangle1986126z/jndok](https://github.com/liangle1986126z/jndok) (github) - [trickest/cve](https://github.com/trickest/cve/blob/main/2016/CVE-2016-4655.md) (trickest) ## Affected products and versions - **Apple**: Iphone Os, Iphone Os 10.0 ## How to fix CVE-2016-4655 Vendor advisory: [http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html](http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html). Because CVE-2016-4655 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2022-06-14. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory. ## Threat activity tracking CVE-2016-4655 2 tracked threats in the Threadlinqs corpus reference CVE-2016-4655, either in the campaign’s CVE list or as an indicator on the campaign record. - [NSO Group Co-Founder Shalev Hulio Held Israeli Diplomatic Passport in Panama, Raising State-Ties Questions for Pegasus Spyware Vendor](https://intel.threadlinqs.com/threat/TL-2026-1748) — INFORMATIONAL · 2026-07-28 - [Pegasus Mercenary Spyware Used for State Surveillance of Azerbaijani Journalists, Activists, and Human Rights Defenders (NSO Group)](https://intel.threadlinqs.com/threat/TL-2026-0751) — HIGH · 2026-06-10 ## Sources Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-07-29. This product uses the NVD API but is not endorsed or certified by the NVD. **Vendor advisory and patch** - [lists.apple.com — vendor advisory](http://lists.apple.com/archives/security-announce/2016/Sep/msg00005.html) - [support.apple.com](https://support.apple.com/HT207107) - [lists.apple.com — vendor advisory (msg00000)](http://lists.apple.com/archives/security-announce/2016/Aug/msg00000.html) - [support.apple.com (HT207145)](https://support.apple.com/HT207145) **Exploit and proof of concept** - [exploit-db.com — exploit](https://www.exploit-db.com/exploits/44836/) **Vulnerability database entry** - [securityfocus.com — vdb entry](http://www.securityfocus.com/bid/92651) - [securitytracker.com — vdb entry](http://www.securitytracker.com/id/1036694) - [securityfocus.com — vdb entry (92965)](http://www.securityfocus.com/bid/92965) **Other references** - [blog.lookout.com](https://blog.lookout.com/blog/2016/08/25/trident-pegasus/) Canonical: https://intel.threadlinqs.com/cve/CVE-2016-4655 Full detection coverage and IOCs for threats exploiting CVE-2016-4655 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp