# CVE-2018-0296: Cisco Adaptive Security Appliance (ASA) Denial-of-Service Vulnerability

Source: https://junglewise.ai/threats/cve-2018-0296-cisco-adaptive-security-appliance-asa-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2018-0296 · Severity: critical · CVSS 7.5 · Exploited in the wild · Published 2021-11-03

A vulnerability in the web interface of Cisco ASA and FTD software due to improper input validation of HTTP URLs allows unauthenticated remote attackers to cause a denial-of-service (DoS) by triggering an unexpected reload. On certain software releases, the vulnerability may instead allow unauthorized information disclosure via directory traversal techniques.

Technologies: [Cisco Adaptive Security Appliance (ASA)](https://junglewise.ai/threats/technologies/adaptive-security-appliance-asa). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2018-0296 exploited in the wild?** Yes. CVE-2018-0296 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2018-0296?** Critical severity, with a CVSS score of 7.5, published 3 November 2021.

**Which products and versions are affected?** Cisco Adaptive Security Appliance (ASA) Software 9.1 before 9.1.7.29, 9.2 before 9.2.4.33, 9.3 before 9.4.4.18, 9.5 before 9.6.4.8, 9.7 before 9.7.1.24, 9.8 before 9.8.2.28, 9.9 before 9.9.2.1; Cisco Firepower Threat Defense (FTD) Software.

**Is there a fix for CVE-2018-0296?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2018-0296 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2018-0296?** Check whether you run Cisco Adaptive Security Appliance (ASA). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Cisco Adaptive Security Appliance (ASA) Software 9.1 before 9.1.7.29, 9.2 before 9.2.4.33, 9.3 before 9.4.4.18, 9.5 before 9.6.4.8, 9.7 before 9.7.1.24, 9.8 before 9.8.2.28, 9.9 before 9.9.2.1
- Cisco Firepower Threat Defense (FTD) Software

## Timeline

- 2018-06-06: disclosed: Vendor advisory published by Cisco
- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2021-11-03: exploited: Confirmed as exploited in the wild per CISA KEV and advisory metadata

## Related threats

- [Cisco Adaptive Security Appliance (ASA) Cross-Site Scripting (XSS) Vulnerability](https://junglewise.ai/threats/cve-2014-2120-cisco-adaptive-security-appliance-asa-cross-site-scripting-xss)
- [Cisco ASA and FTD Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2024-20481-cisco-asa-and-ftd-denial-of-service-vulnerability)
- [Cisco ASA and FTD Denial of Service Vulnerability](https://junglewise.ai/threats/cve-2024-20353-cisco-asa-and-ftd-denial-of-service-vulnerability)
- [Cisco ASA and FTD Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2024-20359-cisco-asa-and-ftd-privilege-escalation-vulnerability)
- [SafePay ransomware campaign](https://junglewise.ai/threats/cve-2020-3259-cisco-asa-and-ftd-information-disclosure-vulnerability)