CVE-2020-3201

mediumpriority · track · 24EPSS 0.003 · 24 %ileEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.31% (24th) EPSS
CVSS 4.9 · medium
Is it mine?
4,006 products
Check your exposure
Who says so?
4 sources
cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

A vulnerability in the Tool Command Language (Tcl) interpreter of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, local attacker with privileged EXEC credentials to cause a denial of service (DoS) condition on an affected system. The vulnerability is due to insufficient input validation of data passed to the Tcl interpreter. An attacker could exploit this vulnerability by executing crafted Tcl arguments on an affected device. An exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

6.5
010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.9mediumAV:L/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 3.9 · impact 6.9
v3.16mediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 1.5 · impact 4
v3.06mediumCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU
v3.06mediumCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:Hsecondary · psirt@cisco.com USexploitability 1.5 · impact 4
v3.16.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:Hsecondary · Cisco PSIRT US
v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.16mediumAV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US
05

affected products (4,006)

Products and version ranges known to be affected.

showing 20 of 4,006
06

advisories (1)

Vendor and ecosystem advisories describing this.

  • cisco-sa-tcl-dos-MAZQUnMFCisco IOS and IOS XE Software Tcl Denial of Service Vulnerability2020-06-03csaf · cisco_csafUS

    A vulnerability in the Tool Command Language (Tcl) interpreter of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, unprivileged, and local attacker to cause a denial of service (DoS) condition on an affected system. The vulnerability is due to insufficient input validation of data passed to the Tcl interpreter. An attacker could exploit this vulnerability by executing crafted Tcl arguments on an affected device. An exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: By default, Tcl shell access requires privilege level 15. Through custom privilege configuration, Tcl shell access could be granted to a lower-privileged user. The CVSS score takes this into consideration. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tcl-dos-MAZQUnMF ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tcl-dos-MAZQUnMF"]

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducisco_csafNVDCVE.orgMITRE
published 2020-06-03modified 2026-06-17
10

references (7)

External citations — patches, advisories, analysis.

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