Cisco ASA 1000V/5000 ISAKMP Packet UDP Packet resource management

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability, which was classified as critical, was found in Cisco ASA 1000V/5000 (Firewall Software). This affects some unknown functionality of the component ISAKMP Packet Handler. The manipulation as part of a UDP Packet leads to a denial of service vulnerability. CWE is classifying the issue as CWE-399. This is going to have an impact on availability.

The weakness was disclosed 10/21/2015 with Cisco as cisco-sa-20151021-asa-ike as confirmed advisory (Website). The advisory is shared at This vulnerability is uniquely identified as CVE-2015-6327 since 08/17/2015. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 93531 (Cisco ASA IKEv1 ISAKMP Packet Handling DoS (cisco-sa-20151021-asa-ike)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO.

It is possible to mitigate the weakness by firewalling udp/500 (isakmp).

The vulnerability is also documented in the databases at X-Force (107411), SecurityTracker (ID 1033914), Vulnerability Center (SBV-53842) and Tenable (93531). The entries 78720, 78719 and 78718 are pretty similar.





CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 7.5
VulDB Temp Score: 6.5
VulDB Vector: 🔍
VulDB Reliability: 🔍



VulDB Base Score: 🔍
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NVD Base Score: 🔍


Class: Denial of service
CWE: CWE-399
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 93531
Nessus Name: Cisco ASA IKEv1 ISAKMP Packet Handling DoS (cisco-sa-20151021-asa-ike)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 800316
OpenVAS Name: Cisco ASA VPN ISAKMP DoS Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
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Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Firewalling: 🔍


08/17/2015 🔍
10/21/2015 +65 days 🔍
10/21/2015 +0 days 🔍
10/21/2015 +0 days 🔍
10/22/2015 +1 days 🔍
10/22/2015 +0 days 🔍
10/24/2015 +2 days 🔍
06/23/2022 +2434 days 🔍



Advisory: cisco-sa-20151021-asa-ike
Organization: Cisco
Status: Confirmed

CVE: CVE-2015-6327 (🔍)
X-Force: 107411 - Cisco Adaptive Security Appliance ISAKMP denial of service
SecurityTracker: 1033914
Vulnerability Center: 53842 - [cisco-sa-20151021-asa-ike] Cisco ASA Remote DoS via Crafted UDP Packets, High
SecurityFocus: 77262 - Cisco Adaptive Security Appliance (ASA) Software CVE-2015-6327 Denial of Service Vulnerability

See also: 🔍


Created: 10/22/2015 10:02 AM
Updated: 06/23/2022 07:35 PM
Changes: (1) source_nessus_risk
Complete: 🔍


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