Medium6.5Cisco

Medium [CVE-2026-20083] Cisco IOS XE Software Secure Copy Protocol Server Denial of Service Vulnerability

This medium-severity Cisco advisory covers CVE-2026-20083 affecting Cisco IOS XE Software 3.5.0E, Cisco IOS XE Software 3.5.1E, Cisco IOS XE Software 3.5.2E.

cisco-sa-scp-dos-duAdXtCg Published Mar 25, 2026Updated by vendor Mar 25, 2026

CVE-2026-20083

Affected products & platforms

CiscoIOS XE

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Summary

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.

Cisco has released software updates that address this vulnerability. There are no workaround…

Affected products named by the advisory: Cisco IOS XE Software 3.5.0E; Cisco IOS XE Software 3.5.1E; Cisco IOS XE Software 3.5.2E; Cisco IOS XE Software 3.5.3E; and 4 more.

Affected versions

Scope: At the time of publication, this vulnerability affected Cisco IOS XE Software if the SCP server feature was enabled.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Workaround status

There are no workarounds that address this vulnerability. However, as a mitigation, administrators may disable the SCP server feature with the privilege EXEC CLI configuration command no ip scp server enable.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Cisco Security Advisories (PSIRT)official
Official vendor feed — the source of truth for this advisory. VulniPulse polled this feed and parsed this entry from it. Discovered from the machine-readable feed https://sec.cloudapps.cisco.com/security/center/psirtrss20/CiscoSecurityAdvisory.xml; this link opens the Cisco advisory index instead of the raw feed document.
Cisco
Vendor advisory pageofficial
Advisory page fetched and parsed to extract affected/fixed versions and mitigation guidance beyond what the feed carries.
Cisco

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-20083NVD CVE.org MITRE

Official resources

Cisco Software Checker
Official documentation
Official tool to confirm whether your exact IOS / IOS XE / NX-OS / ASA / FTD / SD-WAN release is affected and to find the first fixed release.

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