Detections
Analytics
Cisco IOS XE Software TLS Memory Exhaustion DoS (cisco-sa-iosxe-tls-dos-TVgLDEZL)
high Nessus Plugin ID 380318
Synopsis
The remote device is missing a vendor-supplied security patch.Description
According to its self-reported version, Cisco IOS-XE Software is affected by a vulnerability.- A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device. This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition. (CVE-2026-20004)
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCwk59707, CSCwm80596See Also
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwk59707
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwm80596
Plugin Details
Severity: High
ID: 380318
File Name: cisco-sa-iosxe-tls-dos-TVgLDEZL-iosxe.nasl
Version: 1.1
Type: Combined
Family: CISCO
Published: 11/13/2026
Updated: 11/13/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.3
Percentile: 51
CVSS v2
Risk Factor: Medium
Base Score: 6.1
Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2026-20004
CVSS v3
Risk Factor: High
Base Score: 7.4
Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Vulnerability Information
CPE: cpe:/o:cisco:ios_xe
Required KB Items: Host/Cisco/IOS-XE/Version
Patch Publication Date: 3/25/2026
Vulnerability Publication Date: 3/25/2026
Reference Information
CVE: CVE-2026-20004