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HighKEV

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

CVE-2018-0296 · Secure Firewall ASA · CVSS 7.5 · KEV

In brief

Severity · CVSS
High7.5CVSS 3.1, High
EPSS
100%
CISA KEV
Known exploited, listed since 3 Nov 2021
CERT-FR
No advisory or alert referenced in the catalog
Vendor
Cisco
Published · Modified
·
Last verified

Summary

A vulnerability in the web interface of the Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. It is also possible on certain software releases that the ASA will not reload, but an attacker could view sensitive system information without authentication by using directory traversal techniques. The vulnerability is due to lack of proper input validation of the HTTP URL. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. An exploit could allow the attacker to cause a DoS condition or unauthenticated disclosure of information. This vulnerability applies to IPv4 and IPv6 HTTP traffic. This vulnerability affects Cisco ASA Software and Cisco Firepower Threat Defense (FTD) Software that is running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 1000V Cloud Firewall, ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv). Cisco Bug IDs: CSCvi16029.

Weakness: CWE-20, CWE-22

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

7 branches with a published fixed release · 2 branches to migrate

Cisco Adaptive Security Appliance unknown

Source: cisco-sa-20180606-asaftd

  1. 9.9End of life
    Affected versions< 9.9.2.1
    First fixed release9.9.2.1
  2. 9.8End of life
    Affected versions< 9.8.2.28
    First fixed release9.8.2.28
  3. 9.7End of life
    Affected versions< 9.7.1.24
    First fixed release9.7.1.24
  4. 9.6End of life
    Affected versions< 9.6.4.8
    First fixed release9.6.4.8
  5. 9.5End of life
    Affected versionsAll releases of the branch
    First fixed releaseMigration to a fixed release requiredTarget: 9.6.4.8 or later
  6. 9.4End of life
    Affected versions< 9.4.4.18
    First fixed release9.4.4.18
  7. 9.3
    Affected versionsAll releases of the branch
    First fixed releaseMigration to a fixed release requiredTarget: 9.4.4.18 or later
  8. 9.2End of life
    Affected versions< 9.2.4.33
    First fixed release9.2.4.33
  9. 9.1End of life
    Affected versions< 9.1.7.29
    First fixed release9.1.7.29

Remediation

Fix available

Vendor fix

  • Adaptive Security Appliance unknown 9.99.9.2.1
  • Adaptive Security Appliance unknown 9.89.8.2.28
  • Adaptive Security Appliance unknown 9.79.7.1.24
  • Adaptive Security Appliance unknown 9.69.6.4.8
  • Adaptive Security Appliance unknown 9.49.4.4.18
  • Adaptive Security Appliance unknown 9.29.2.4.33
  • Adaptive Security Appliance unknown 9.19.1.7.29

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Branches without a fix of their own: migrate to a fixed release

  • Adaptive Security Appliance unknown 9.5 → 9.6.4.8
  • Adaptive Security Appliance unknown 9.3 → 9.4.4.18

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-20180606-asaftd

Workarounds (vendor)

Cisco states in its advisory that no workaround is available.

SourceCisco Security Advisory cisco-sa-20180606-asaftd

CISA KEV required action

Apply updates per vendor instructions.

CISA due date:

SourceCISA KEV

Last verified 1 Oct 2026 at 09:30 UTC

Known exploitation

Added to CISA KEV on 3 Nov 2021

Federal remediation due date: 3 May 2022

The CISA required action is shown under Remediation.

100% probability of exploitation in the next 30 days (percentile 100%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CERT-FR

No CERT-FR advisory or alert of the last two years references this CVE, for the vendors Patcharo covers.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

Known exploited

References

Vendor advisory

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-20180606-asaftd

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-20349Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service VulnerabilityHighKEV
  • CVE-2025-20362Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization VulnerabilityHighKEV
  • CVE-2025-20333Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow VulnerabilityCriticalKEV
  • CVE-2024-20481Cisco ASA and FTD Denial-of-Service VulnerabilityMediumKEV
  • CVE-2024-20359Cisco ASA and FTD Privilege Escalation VulnerabilityMediumKEV

All Secure Firewall ASA vulnerabilitiesAll Cisco vulnerabilities