What is CVE-2026-0277?

CVE-2026-0277 is a medium-severity vulnerability in Apple Iphone OS, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2026-07-09.

How severe is CVE-2026-0277?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Apple Iphone OS

CVE-2026-0277

An improper certificate validation vulnerability in the Prisma® Access Agent for iOS enables an attacker to perform a man-in-the-middle (MitM) attack to intercept VPN traffic. The Prisma Access Agent on Windows, macOS, Linux, Android and ChromeOS are not affected.

Vulnerability class: Improper Certificate Validation

EPSS: 0.001 (1.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Apple Iphone_os
Palo Alto Networks Prisma Access Agent — versions 0, All
Paloaltonetworks Prisma_access_agent

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

psirt@paloaltonetworks.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-0277?: CVE-2026-0277 is a medium-severity vulnerability in Apple Iphone OS, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2026-07-09.
How severe is CVE-2026-0277?: Medium severity. CVSS v3 base score is 5.9 out of 10.