CVE-2020-3201
Cisco IOS and IOS XE Software Tcl Denial of Service Vulnerability
MEDIUM
6
CVSS Score
Published: June 3, 2020 at 05:40 PM UTC
Updated: June 17, 2026 at 03:17 AM UTC
2 products affected across 1 vendorIOSIOS Xe
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Severity
MEDIUM6
Exploit prediction
EPSS 0.3%
SSVC
No known exploit
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
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(4)s215.2(4)s315.2(4)s3a15.2(4)s415.2(4)s4a15.2(4)s515.2(4)s615.2(4)s715.2(4)s815.3(0)sy15.3(1)s15.3(1)s115.3(1)s1e15.3(1)s215.3(1)sy15.3(1)sy115.3(1)sy215.3(1)t15.3(1)t115.3(1)t215.3(1)t315.3(1)t415.3(2)s15.3(2)s115.3(2)s215.3(2)t15.3(2)t115.3(2)t215.3(2)t315.3(2)t415.3(3)jaa115.3(3)jpi15.3(3)jpj15.3(3)m15.3(3)m115.3(3)m1015.3(3)m215.3(3)m315.3(3)m415.3(3)m515.3(3)m615.3(3)m715.3(3)m815.3(3)m8a15.3(3)m915.3(3)s15.3(3)s115.3(3)s1015.3(3)s1a15.3(3)s215.3(3)s2a15.3(3)s315.3(3)s415.3(3)s515.3(3)s615.3(3)s6a15.3(3)s715.3(3)s815.3(3)s8a15.3(3)s915.3(3)xb1215.4(1)cg15.4(1)cg115.4(1)s15.4(1)s115.4(1)s215.4(1)s315.4(1)s415.4(1)sy15.4(1)sy115.4(1)sy215.4(1)sy315.4(1)sy415.4(1)t15.4(1)t115.4(1)t215.4(1)t315.4(1)t415.4(2)cg15.4(2)s15.4(2)s115.4(2)s215.4(2)s315.4(2)s415.4(2)sn15.4(2)sn115.4(2)t15.4(2)t115.4(2)t215.4(2)t315.4(2)t415.4(3)m15.4(3)m115.4(3)m1015.4(3)m215.4(3)m315.4(3)m415.4(3)m515.4(3)m615.4(3)m6a15.4(3)m715.4(3)m7a15.4(3)m815.4(3)m915.4(3)s15.4(3)s0d15.4(3)s0e15.4(3)s0f15.4(3)s115.4(3)s1015.4(3)s215.4(3)s315.4(3)s415.4(3)s515.4(3)s615.4(3)s6a15.4(3)s715.4(3)s815.4(3)s915.4(3)sn115.4(3)sn1a15.5(1)s15.5(1)s115.5(1)s215.5(1)s315.5(1)s415.5(1)sn15.5(1)sn115.5(1)sy15.5(1)sy115.5(1)sy215.5(1)sy315.5(1)sy415.5(1)t15.5(1)t115.5(1)t215.5(1)t315.5(1)t415.5(2)s15.5(2)s115.5(2)s215.5(2)s315.5(2)s415.5(2)sn15.5(2)t15.5(2)t115.5(2)t215.5(2)t315.5(2)t415.5(2)xb15.5(3)m15.5(3)m0a15.5(3)m115.5(3)m1015.5(3)m215.5(3)m2a15.5(3)m315.5(3)m415.5(3)m4a15.5(3)m4b15.5(3)m4c15.5(3)m515.5(3)m615.5(3)m6a15.5(3)m715.5(3)m815.5(3)m915.5(3)s15.5(3)s0a15.5(3)s115.5(3)s1015.5(3)s1a15.5(3)s215.5(3)s315.5(3)s415.5(3)s515.5(3)s615.5(3)s6a15.5(3)s6b15.5(3)s715.5(3)s815.5(3)s915.5(3)s9a15.5(3)sn15.5(3)sn0a15.6(1)s15.6(1)s115.6(1)s215.6(1)s315.6(1)s415.6(1)sn15.6(1)sn115.6(1)sn215.6(1)sn315.6(1)t15.6(1)t0a15.6(1)t115.6(1)t215.6(1)t315.6(2)s15.6(2)s115.6(2)s215.6(2)s315.6(2)s415.6(2)sn15.6(2)sp15.6(2)sp115.6(2)sp215.6(2)sp315.6(2)sp415.6(2)sp515.6(2)sp615.6(2)sp715.6(2)t15.6(2)t0a15.6(2)t115.6(2)t215.6(2)t315.6(3)m15.6(3)m0a15.6(3)m115.6(3)m1a15.6(3)m1b15.6(3)m215.6(3)m2a15.6(3)m315.6(3)m3a15.6(3)m415.6(3)m515.6(3)m615.6(3)m6a15.6(3)m6b15.6(3)m715.6(3)sn15.6(4)sn15.6(5)sn15.6(6)sn15.6(7)sn15.6(7)sn115.6(7)sn215.7(3)m15.7(3)m0a15.7(3)m115.7(3)m215.7(3)m315.7(3)m415.7(3)m4a15.7(3)m4b15.7(3)m515.8(3)m15.8(3)m0a15.8(3)m0b15.8(3)m115.8(3)m1a15.8(3)m215.8(3)m2a15.8(3)m315.8(3)m3a15.8(3)m3b15.9(3)m15.9(3)m0a
16.1.116.1.216.1.316.10.116.10.1a16.10.1b16.10.1c16.10.1d16.10.1e16.10.1f16.10.1g16.10.1s16.10.216.11.116.11.1a16.11.1b16.11.1c16.11.1s16.12.116.12.1a16.12.1c16.12.1s16.12.1t16.12.1w16.12.1y16.12.216.12.2a16.2.116.2.216.3.116.3.1a16.3.216.3.316.3.416.3.516.3.5b16.3.616.3.716.3.816.3.916.4.116.4.216.4.316.5.116.5.1a16.5.1b16.5.216.5.316.6.116.6.216.6.316.6.416.6.4a16.6.4s16.6.516.6.5a16.6.5b16.6.616.6.716.6.7a16.7.116.7.1a16.7.1b16.7.216.7.316.7.416.8.116.8.1a16.8.1b16.8.1c16.8.1d16.8.1e16.8.1s16.8.216.8.316.9.116.9.1a16.9.1b16.9.1c16.9.1d16.9.1s16.9.216.9.2a16.9.2s16.9.316.9.3a16.9.3h16.9.3s16.9.416.9.4c3.10.0s3.10.10s3.10.1s3.10.2as3.10.2s3.10.2ts3.10.3s3.10.4s3.10.5s3.10.6s3.10.7s3.10.8as3.10.8s3.10.9s3.11.0s3.11.1s3.11.2s3.11.3s3.11.4s3.12.0as3.12.0s3.12.1s3.12.2s3.12.3s3.12.4s3.13.0as3.13.0s3.13.10s3.13.1s3.13.2as3.13.2s3.13.3s3.13.4s3.13.5as3.13.5s3.13.6as3.13.6bs3.13.6s3.13.7as3.13.7s3.13.8s3.13.9s3.14.0s3.14.1s3.14.2s3.14.3s3.14.4s3.15.0s3.15.1cs3.15.1s3.15.2s3.15.3s3.15.4s3.16.0as3.16.0bs3.16.0cs3.16.0s3.16.10s3.16.1as3.16.1s3.16.2as3.16.2bs3.16.2s3.16.3as3.16.3s3.16.4as3.16.4bs3.16.4cs3.16.4ds3.16.4es3.16.4gs3.16.4s3.16.5as3.16.5bs3.16.5s3.16.6bs3.16.6s3.16.7as3.16.7bs3.16.7s3.16.8s3.16.9s3.17.0s3.17.1as3.17.1s3.17.2s3.17.3s3.17.4s3.18.0as3.18.0s3.18.0sp3.18.1asp3.18.1bsp3.18.1csp3.18.1gsp3.18.1hsp3.18.1isp3.18.1s3.18.1sp3.18.2asp3.18.2s3.18.2sp3.18.3asp3.18.3bsp3.18.3s3.18.3sp3.18.4s3.18.4sp3.18.5sp3.18.6sp3.18.7sp3.2.0sg3.2.10sg3.2.11sg3.2.1sg3.2.2sg3.2.3sg3.2.4sg3.2.5sg3.2.6sg3.2.7sg3.2.8sg3.2.9sg3.3.0sq3.3.1sq3.4.0sq3.4.1sq3.5.0sq3.5.1sq3.5.2sq3.5.3sq3.5.4sq3.5.5sq3.5.6sq3.5.7sq3.5.8sq3.7.0bs3.7.0s3.7.1as3.7.1s3.7.2s3.7.2ts3.7.3s3.7.4as3.7.4s3.7.5s3.7.6s3.7.7s3.7.8s3.8.0s3.8.1s3.8.2s3.9.0as3.9.0s3.9.1as3.9.1s3.9.2s
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor Advisoryx_refsource_CISCOPatch
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-tcl-dos-MAZQUnMFSSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- HIGH
- User Interaction
- NONE
- Scope
- CHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-20
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