Cisco Adaptive Security Appliance Software VPN Denial of Service Vulnerability

published 2019-05-03 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-10262

cvss: 5.3; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.0%; EPSS 2.0% chance of exploitation in 30 days, percentile 81%
public exploits: 0; none known

A vulnerability in the remote access VPN session manager of Cisco Adaptive Security Appliance (ASA) Software could allow a unauthenticated, remote attacker to cause a denial of service (DoS) condition on the remote access VPN services. The vulnerability is due to an issue with the remote access VPN session manager. An attacker could exploit this vulnerability by requesting an excessive number of remote access VPN sessions. An exploit could allow the attacker to cause a DoS condition.

Patch / fix

fixed in 1

Cisco Cisco Adaptive Security Appliance (ASA) Software 9.4.4.34, 9.6.4.25, 9.8.4, 9.9.2.50, 9.10.1.17

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 23 mo ago (2024-11-19)

Exploit prediction

2.04% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD	3.0	5.9	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

Cisco Cisco Adaptive Security Appliance (ASA) Software

Classification

Weakness

CWE-404 Improper Resource Shutdown or Release

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-vpn-dos
vendor-advisory
securityfocus.com /bid/108151
vdb-entry, third-party-advisory

Sources

CVE List CVE-2019-1705
NVD CVE-2019-1705

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary