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CVE-2018-0101

Affected software2 products, listed below
Severity10.0 Critical CVSS 3.0 2 scores
WeaknessCWE-415
Published29 Jan 2018
Updated11 Aug 2026

Description

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 control of the system, or cause a reload of the affected device. This vulnerability affects Cisco ASA Software that is running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), 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, ASA 1000V Cloud Firewall, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4110 Security Appliance, Firepower 9300 ASA Security Module, Firepower Threat Defense Software (FTD). Cisco Bug IDs: CSCvg35618.

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.
  • CISA KEV not listed
  • VulnCheck KEV listed Exploitation reported in the wild. 1 citation · 1 exploit · earliest 2018-01-29.
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 3 indexed Published artifacts you can open, in Exploit-DB, GitHub PoC; first seen 2018-02-07.
  • EPSS 87% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99.7% of all scored CVEs.

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2018-0101 in VulnCheck (free account).

EvidenceSourceDetailDate
Reported exploitation sec.cloudapps.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20180129-asa1 2018-01-29
Exploit reference VulnCheck XDB 7ac4b38ded5e Exploit type: denial-of-service 2023-12-21
IndexArtifactStarsFirst seen
GitHub PoC A low interaction honeypot for the Cisco ASA component capable of detecting CVE-2018-0101, a DoS and remote code execution vulnerability. 55 2018-02-08
GitHub PoC 1337g/CVE-2018-0101-DOS-POC 14 2018-02-07
Exploit-DB Cisco ASA - Crash (PoC) 2018-02-07

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

10.0 CRITICAL v3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.0 10.0 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H NVD Primary published
CVSS 2.0 10.0 none AV:N/AC:L/Au:N/C:C/I:C/A:C NVD Primary

Affected software and releases

Products and versions

2 products, 13 version entries
SourceVendorProductSchemeAffected versions
nvd cisco adaptive security appliance software generic ＜ 9.1.7.23 · ≥ 9.2.0 and ＜ 9.2.4.27 · ≥ 9.3.0 and ＜ 9.4.4.16 · ≥ 9.5.0 and ＜ 9.6.4.3 · ≥ 9.7.0 and ＜ 9.7.1.21 · ≥ 9.8.0 and ＜ 9.8.2.20 · ≥ 9.9.0 and ＜ 9.9.1.2
nvd cisco secure firewall threat defense generic 6.0.0 · 6.0.1 · 6.1.0 · 6.2.0 · 6.2.1 · 6.2.2

References

URLTags
http://www.securityfocus.com/bid/102845 Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040292 Third Party Advisory, VDB Entry
https://icanthackit.wordpress.com/2018/01/30/thoughts-on-the-handling-cve-2018-0101-cisco-bug-cscvg35618/ Third Party Advisory
https://pastebin.com/YrBcG2Ln Exploit, Third Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180129-asa1 Vendor Advisory
https://www.exploit-db.com/exploits/43986/ Exploit, Third Party Advisory, VDB Entry

Timeline
Published2018-01-29By the CVE Program.
VulnCheck KEV: earliest evidence2018-01-29Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
VulnCheck KEV: latest evidence2023-12-21Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.
NVD record modified2026-08-11NVD's own last-modified date for this record.