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Home›CVE index›CVE-2018-0101
Priority reviewCritical

CVE-2018-0101

Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense

A vulnerability in the Secure Sockets Layer (SSL) VPN functionality of the Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause a reload of the affected system or to remotely execute code. The vulnerability is due to an attempt to double free a region of memory when the webvpn feature is enabled on the Cisco ASA device. An attacker could exploit this vulnerability by sending multiple, crafted XML packets to a webvpn-configured interface on the affected system. An exploit could allow the attacker to execute arbitrary code and obtain full c...

CVSS
10
EPSS
86.8%
99.7% percentile
CISA KEV
Not listed
Published
2018.01.30
PRIORITY ASSESSMENT

Priority review

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV
Exploit probability86.8%
Technical severityCVSS 10

Vulnerability overview

A vulnerability in the Secure Sockets Layer (SSL) VPN functionality of the Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause a reload of the affected system or to remotely execute code. The vulnerability is due to an attempt to double free a region of memory when the webvpn feature is enabled on the Cisco ASA device. An attacker could exploit this vulnerability by sending multiple, crafted XML packets to a webvpn-configured interface on the affected system. An exploit could allow the attacker to execute arbitrary code and obtain full c...

Affected product and versions

Product
Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense
Affected versions
>= Cisco Adaptive Security Appliance, < 9.1.7.23, >= 9.2.0 < 9.2.4.27, >= 9.3.0 < 9.4.4.16, >= 9.5.0 < 9.6.4.3, >= 9.7.0 < 9.7.1.21, >= 9.8.0 < 9.8.2.20, >= 9.9.0 < 9.9.1.2, 6.0.0, 6.0.1, 6.1.0, 6.2.0, 6.2.1, 6.2.2
Fixed versions
9.1.7.23, 9.2.4.27, 9.4.4.16, 9.6.4.3, 9.7.1.21, 9.8.2.20, 9.9.1.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Cisco Adaptive Security Appliance, adaptive security appliance software, secure firewall threat defense and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-415