VPN Vulnerabilities to Patch: 13 Urgent Edge Flaws
Remote access appliances keep showing up in incident timelines for a simple reason: they sit on the public edge, they make trust decisions, and they often stand between an attacker and the rest of the environment. When one of these systems is exposed and unpatched, the path from internet scanning to internal foothold can become much shorter. That is the same pattern already reflected in your related internal coverage of Ransomware Initial Access in 2026, KEV vs CVSS Patch Priority, and CISA KEV Update.
A neutral, source-led article works best here. Instead of sounding promotional or generic, this draft uses the CISA Known Exploited Vulnerabilities Catalog and official vendor advisories as the factual backbone, then adds practical interpretation around prioritization, identity hardening, and detection speed. That style is closer to a reference article than a sales page, which is the right tone for search, trust, and AdSense-quality readability.
Table of Contents
Why VPN vulnerabilities to patch should come first
The reason VPN vulnerabilities to patch matter so much is straightforward. These flaws affect systems that are both reachable from the internet and trusted by the organization, which means the security consequence is not just a technical bug but a direct exposure problem. CISA’s KEV program is built around that same reality: known exploitation matters because it tells defenders which issues attackers are already using in the real world.
That is also why patching by raw score alone is not enough. A high CVSS issue on an internal system may be less urgent than a lower-profile edge weakness with public exposure, active exploitation, or a direct path to privileged access. That is the core logic behind your internal page on KEV vs CVSS Patch Priority, and it fits this topic naturally.
13 VPN vulnerabilities to patch first this quarter
1) CVE-2025-22457 — Ivanti Connect Secure, Policy Secure, and ZTA Gateways
Ivanti said this issue was fully patched in supported releases, and CISA lists it in the KEV catalog. For any internet-facing Ivanti estate, that combination alone moves it into the first patch wave. Ivanti advisory
2) CVE-2025-0282 — Ivanti Connect Secure, Policy Secure, and ZTA Gateways
Ivanti said successful exploitation of CVE-2025-0282 can lead to unauthenticated remote code execution, and CISA tied it to RESURGE malware activity and KEV inclusion. That makes it one of the clearest VPN vulnerabilities to patch immediately. Ivanti advisory
3) CVE-2023-46805 — Ivanti Connect Secure and Policy Secure
This authentication bypass issue still matters because many organizations keep edge appliances in production longer than planned. CISA and partners said threat actors were actively exploiting it as part of the Ivanti attack chain. CISA advisory
4) CVE-2024-21887 — Ivanti Connect Secure and Policy Secure
CVE-2024-21887 is the command injection partner to the Ivanti authentication bypass problem. In practical terms, that pairing is exactly why the Ivanti gateway cluster became such a serious initial-access concern. Ivanti advisory
5) CVE-2024-21893 — Ivanti Connect Secure and Policy Secure
CISA described CVE-2024-21893 as a server-side request forgery vulnerability and said it was part of the actively exploited Ivanti set. That means defenders should treat it as part of the same urgent remediation cluster rather than as a side issue. CISA advisory
6) CVE-2024-21762 — FortiOS and FortiProxy SSL-VPN
Fortinet said this out-of-bounds write in sslvpnd may allow a remote unauthenticated attacker to execute arbitrary code or commands, and the advisory notes potential exploitation in the wild. For exposed SSL-VPN deployments, this belongs at the front of the queue. Fortinet PSIRT advisory
7) CVE-2024-55591 — FortiOS and FortiProxy
Fortinet said this authentication-bypass issue may allow a remote attacker to gain super-admin privileges through crafted requests, and the company said reports show it is being exploited in the wild. That is not a backlog item. That is a perimeter-access risk. Fortinet PSIRT advisory
8) CVE-2025-24472 — FortiOS and FortiProxy
Fortinet later updated the same advisory family to include CVE-2025-24472. Because it sits in the same alternate-path authentication-bypass area as CVE-2024-55591, it makes sense to validate both together during the same review. Fortinet PSIRT advisory
9) CVE-2024-3400 — PAN-OS GlobalProtect
Palo Alto Networks said CVE-2024-3400 can allow an unauthenticated attacker to execute arbitrary code with root privileges on affected firewalls in specific GlobalProtect configurations. CISA also lists it in KEV, which is why it remains one of the most important edge-device fixes to verify. Palo Alto advisory
10) CVE-2025-0133 — PAN-OS GlobalProtect Gateway and Portal
Palo Alto Networks said this reflected XSS issue can execute malicious JavaScript in the browser of an authenticated Captive Portal user, with the main risk being phishing and credential theft, especially where Clientless VPN is enabled. It is not the loudest bug on the list, but on a public access surface it still matters. Palo Alto advisory
11) CVE-2026-0227 — PAN-OS GlobalProtect Gateway and Portal
Palo Alto Networks said this issue allows an unauthenticated attacker to cause a denial of service and, with repeated attempts, force the firewall into maintenance mode. It is newer than most of the other entries here, which is exactly why it belongs in a current-quarter patch list. Palo Alto advisory
12) CVE-2024-38475 — SonicWall SMA100 SSL-VPN
SonicWall’s 2025 urgent advisory said CVE-2024-38475 was being actively exploited and associated with session hijacking and the OVERSTEP rootkit campaign against SMA 100 appliances. When a vendor is warning about rootkit persistence and rebuild steps, the risk is well beyond ordinary maintenance. SonicWall urgent advisory
13) CVE-2024-53704 — SonicWall SonicOS SSLVPN
SonicWall’s PSIRT advisory said public proof-of-concept material became available for CVE-2024-53704, an SSLVPN authentication bypass issue in SonicOS. On exposed firewalls, public exploit attention is enough reason to move quickly even when exploitation reporting is still developing. SonicWall PSIRT advisory
How to prioritize patching this quarter
A sensible order is to patch first the issues tied to known exploitation, unauthenticated access, authentication bypass, remote code execution, or super-admin privilege gain. In practice, that means the Ivanti cluster, Fortinet CVE-2024-21762 and the FortiOS/FortiProxy auth-bypass pair, Palo Alto CVE-2024-3400, and SonicWall CVE-2024-38475 should all sit in the first remediation wave. CISA’s KEV model supports that kind of threat-informed prioritization much better than a score-only approach.
This is also a good place to add an internal bridge to AI Vulnerability Exploitation Patch Windows, because shorter disclosure-to-exploitation windows make slow approval cycles harder to defend. The patching question is no longer only “how severe is this?” It is increasingly “how fast can this be used against us?”
What to do after patching
Patching should not be the last step. Teams should also review whether clientless access is really necessary, restrict management exposure, rotate administrative credentials where compromise is plausible, and check logs for unusual session behavior, unexpected admin creation, or signs of persistence. SonicWall’s SMA100 guidance is especially clear that patching alone may not be enough in environments touched by rootkit or session-theft activity.
This section is also the natural place for internal links that deepen the article without feeling forced. Identity hardening can point readers to Phishing-Resistant MFA Checklist and Passkeys vs MFA vs SMS 2FA. Detection and containment can point to Mean Time to Detect and Dwell Time, because a fast patch matters most when teams can also spot post-compromise activity quickly.
Final takeaway
The main lesson is simple. VPN vulnerabilities to patch should sit near the top of every quarterly remediation plan because these systems are exposed, trusted, and repeatedly targeted. When time is limited, patch the edge before comfort-zone infrastructure, then harden identity and reduce detection time so a missed appliance does not become a full-scale incident. That framing also connects cleanly with your existing internal content on Ransomware Initial Access in 2026, CISA KEV Update, and Mean Time to Detect.
