Cisco IOS Software Integrated Services Module for VPN Denial-of-Service Vulnerability
- Severity
- High7.5CVSS 3.1, High
- Known exploited
- Known exploitedFederal remediation due date: 17 Mar 2022
- Exploit prediction
- 7%
- Published
- 28 Mar 2018Updated 17 Jun 2026 · Last verified 29 Sept 2026
Description
Title, description and vendor guidance are quoted from the source records.
A vulnerability in the crypto engine of the Cisco Integrated Services Module for VPN (ISM-VPN) running Cisco IOS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient handling of VPN traffic by the affected device. An attacker could exploit this vulnerability by sending crafted VPN traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to hang or crash, resulting in a DoS condition. Cisco Bug IDs: CSCvd39267.
Weakness: CWE-399
Known exploited
Added to CISA KEV on 3 Mar 2022
Federal remediation due date: 17 Mar 2022
Required action: Apply updates per vendor instructions.
Exploit prediction
7% probability of exploitation in the next 30 days (percentile 94%).
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Patcharo shows this vulnerability for information but does not match versions for this product yet.
- n/a Cisco IOS · Cisco IOS
References
Provenance
Every fact on this page comes from the sources below. Nothing is written by an AI.
- Cisco (CVE record)
- Cisco (CVE record) · 29 Sept 2026 at 18:17 UTC · Parser patcharo-cve5/1.1.0
- CISA Known Exploited Vulnerabilities
- CISA Known Exploited Vulnerabilities · 29 Sept 2026 at 18:17 UTC · Parser patcharo-kev/1.0.0
- NVD
- NVD · 27 Sept 2026 at 23:44 UTC · Parser patcharo-nvd/1.0.0
- FIRST EPSS
- FIRST EPSS · 30 Sept 2026 at 00:17 UTC · Parser patcharo-epss/1.0.0
Last verified: 29 Sept 2026 at 18:17 UTC