Cisco IOS XE up to 17.18.1w Secure Copy Protocol parameter pollution

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Cisco IOS XE. It has been classified as problematic. The affected element is an unknown function of the component Secure Copy Protocol. The manipulation leads to parameter pollution. This vulnerability is listed as CVE-2026-20083. The attack must be carried out locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Cisco IOS XE and classified as problematic. This issue affects an unknown code block of the component Secure Copy Protocol. The manipulation with an unknown input leads to a parameter pollution vulnerability. Using CWE to declare the problem leads to CWE-235. The product does not handle or incorrectly handles when the number of parameters, fields, or arguments with the same name exceeds the expected amount. Impacted is availability. The summary by CVE is:

A vulnerability in the Secure Copy Protocol (SCP) server feature of Cisco IOS XE Software could allow an authenticated, local attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of a malformed SCP request. An attacker could exploit this vulnerability by issuing a crafted command through SSH. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.

It is possible to read the advisory at sec.cloudapps.cisco.com. The identification of this vulnerability is CVE-2026-20083 since 10/08/2025. The exploitation is known to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 305771 (Cisco IOS XE Software Secure Copy Protocol Server DoS (cisco-sa-scp-dos-duAdXtCg)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (305771) and EUVD (EUVD-2026-15429). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (cisco): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Parameter pollution
CWE: CWE-235 / CWE-233 / CWE-229
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305771
Nessus Name: Cisco IOS XE Software Secure Copy Protocol Server DoS (cisco-sa-scp-dos-duAdXtCg)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/08/2025 CVE reserved
03/25/2026 +168 days Advisory disclosed
03/25/2026 +0 days VulDB entry created
04/12/2026 +18 days VulDB entry last update

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-scp-dos-duAdXtCg
Status: Confirmed

CVE: CVE-2026-20083 (🔒)
GCVE (CVE): GCVE-0-2026-20083
GCVE (VulDB): GCVE-100-353183
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 03/25/2026 17:24
Updated: 04/12/2026 17:02
Changes: 03/25/2026 17:24 (64), 03/25/2026 18:28 (1), 03/31/2026 01:10 (1), 04/12/2026 17:02 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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