Secuno
ENNL
Book demo

CVE-2025-20243

Denial of service

8.6 HIGHEPSS 0.61%
  1. Published14 Aug 2025

Description

A vulnerability in the management and VPN web servers of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condition. This vulnerability is due to improper validation of user-supplied input on an interface with VPN web services. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on an affected device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-201548.6
A vulnerability in the system rate-limiting process for syslog message 419002 of Cisco…
CVE-2026-314489.4
In the Linux kernel, the following vulnerability has been resolved: ext4: avoid…
CVE-2026-255338.8
Enclave is a secure JavaScript sandbox designed for safe AI agent code execution. Prior…
CVE-2025-681378.3
EVerest is an EV charging software stack. Prior to version 2025.10.0, an integer…
CVE-2025-551188.9
Memory corruptions can be remotely triggered in the Control-M/Agent when SSL/TLS…
CVE-2025-202538.6
A vulnerability in the IKEv2 feature of Cisco IOS Software, IOS XE Software, Secure…

Frequently asked

Is CVE-2025-20243 being actively exploited?

CVE-2025-20243 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.61%.

How severe is CVE-2025-20243?

CVE-2025-20243 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 0.61% probability of exploitation.

How do I fix CVE-2025-20243?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-20243 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.