CVE-2021-1383 | Cisco IOS XE SD-WAN Software Parameter Injection Vulnerabilities

Exp

Multiple vulnerabilities in the CLI of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker to access the underlying operating system with root privileges. These vulnerabilities are due to insufficient input validation of certain CLI commands. An attacker could exploit these vulnerabilities by authenticating to the device and submitting crafted input to the CLI. The attacker must be authenticated as an administrative user to execute the affected commands. A successful exploit could allow the attacker to access the underlying operating system with root privileges.

Published: 2021-03-24 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-1383 is rated Exploit Available (54.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.59%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-1383

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-1383

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.15% 0.59% +0.44%
2 2025-12-28 0.16% 0.15% -0.01%
3 2025-12-27 — 0.16% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1383

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.0 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 0.8 5.2 [email protected]
6.7 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 0.8 5.9 [email protected]
7.2 2.0 HIGH
AV:L/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.9 10.0 [email protected]

Weakness enumeration for CVE-2021-1383

Affected software / configurations for CVE-2021-1383

Vendor Product Version Raw CPE
cisco ios_xe 16.9.1 cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:*
cisco ios_xe 16.9.2 cpe:2.3:o:cisco:ios_xe:16.9.2:*:*:*:*:*:*:*
cisco ios_xe 16.9.3 cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:*
cisco ios_xe 16.9.4 cpe:2.3:o:cisco:ios_xe:16.9.4:*:*:*:*:*:*:*
cisco ios_xe 16.10.1 cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:*
cisco ios_xe 16.10.1a cpe:2.3:o:cisco:ios_xe:16.10.1a:*:*:*:*:*:*:*
cisco ios_xe 16.10.1b cpe:2.3:o:cisco:ios_xe:16.10.1b:*:*:*:*:*:*:*
cisco ios_xe 16.10.1c cpe:2.3:o:cisco:ios_xe:16.10.1c:*:*:*:*:*:*:*
cisco ios_xe 16.10.1d cpe:2.3:o:cisco:ios_xe:16.10.1d:*:*:*:*:*:*:*
cisco ios_xe 16.10.1e cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:*
cisco ios_xe 16.10.1f cpe:2.3:o:cisco:ios_xe:16.10.1f:*:*:*:*:*:*:*
cisco ios_xe 16.10.1g cpe:2.3:o:cisco:ios_xe:16.10.1g:*:*:*:*:*:*:*
cisco ios_xe 16.10.1s cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:*
cisco ios_xe 16.10.2 cpe:2.3:o:cisco:ios_xe:16.10.2:*:*:*:*:*:*:*
cisco ios_xe 16.10.3 cpe:2.3:o:cisco:ios_xe:16.10.3:*:*:*:*:*:*:*
cisco ios_xe 16.11.1 cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:*
cisco ios_xe 16.11.1a cpe:2.3:o:cisco:ios_xe:16.11.1a:*:*:*:*:*:*:*
cisco ios_xe 16.11.1b cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:*
cisco ios_xe 16.11.1c cpe:2.3:o:cisco:ios_xe:16.11.1c:*:*:*:*:*:*:*
cisco ios_xe 16.11.1s cpe:2.3:o:cisco:ios_xe:16.11.1s:*:*:*:*:*:*:*
cisco ios_xe 16.11.2 cpe:2.3:o:cisco:ios_xe:16.11.2:*:*:*:*:*:*:*
cisco ios_xe 16.12.1 cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:*
cisco ios_xe 16.12.1a cpe:2.3:o:cisco:ios_xe:16.12.1a:*:*:*:*:*:*:*
cisco ios_xe 16.12.1c cpe:2.3:o:cisco:ios_xe:16.12.1c:*:*:*:*:*:*:*
cisco ios_xe 16.12.1s cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:*
cisco ios_xe 16.12.1t cpe:2.3:o:cisco:ios_xe:16.12.1t:*:*:*:*:*:*:*
cisco ios_xe 16.12.1w cpe:2.3:o:cisco:ios_xe:16.12.1w:*:*:*:*:*:*:*
cisco ios_xe 16.12.1x cpe:2.3:o:cisco:ios_xe:16.12.1x:*:*:*:*:*:*:*
cisco ios_xe 16.12.1y cpe:2.3:o:cisco:ios_xe:16.12.1y:*:*:*:*:*:*:*
cisco ios_xe 16.12.1z cpe:2.3:o:cisco:ios_xe:16.12.1z:*:*:*:*:*:*:*
cisco ios_xe 16.12.1z1 cpe:2.3:o:cisco:ios_xe:16.12.1z1:*:*:*:*:*:*:*
cisco ios_xe 16.12.1za cpe:2.3:o:cisco:ios_xe:16.12.1za:*:*:*:*:*:*:*
cisco ios_xe 16.12.2 cpe:2.3:o:cisco:ios_xe:16.12.2:*:*:*:*:*:*:*
cisco ios_xe 16.12.2a cpe:2.3:o:cisco:ios_xe:16.12.2a:*:*:*:*:*:*:*
cisco ios_xe 16.12.2s cpe:2.3:o:cisco:ios_xe:16.12.2s:*:*:*:*:*:*:*
cisco ios_xe 16.12.2t cpe:2.3:o:cisco:ios_xe:16.12.2t:*:*:*:*:*:*:*
cisco ios_xe 16.12.3 cpe:2.3:o:cisco:ios_xe:16.12.3:*:*:*:*:*:*:*
cisco ios_xe 16.12.3a cpe:2.3:o:cisco:ios_xe:16.12.3a:*:*:*:*:*:*:*
cisco ios_xe 16.12.3s cpe:2.3:o:cisco:ios_xe:16.12.3s:*:*:*:*:*:*:*
cisco ios_xe 16.12.4 cpe:2.3:o:cisco:ios_xe:16.12.4:*:*:*:*:*:*:*
cisco ios_xe 16.12.4a cpe:2.3:o:cisco:ios_xe:16.12.4a:*:*:*:*:*:*:*
cisco ios_xe 16.12.5 cpe:2.3:o:cisco:ios_xe:16.12.5:*:*:*:*:*:*:*
cisco ios_xe 16.12.5b cpe:2.3:o:cisco:ios_xe:16.12.5b:*:*:*:*:*:*:*
cisco ios_xe 17.1.1 cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:*
cisco ios_xe 17.1.1a cpe:2.3:o:cisco:ios_xe:17.1.1a:*:*:*:*:*:*:*
cisco ios_xe 17.1.1s cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:*
cisco ios_xe 17.1.1t cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:*
cisco ios_xe 17.1.2 cpe:2.3:o:cisco:ios_xe:17.1.2:*:*:*:*:*:*:*
cisco ios_xe 17.1.3 cpe:2.3:o:cisco:ios_xe:17.1.3:*:*:*:*:*:*:*
cisco ios_xe 17.2.1 cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:*
cisco ios_xe 17.2.1a cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:*
cisco ios_xe 17.2.1r cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:*
cisco ios_xe 17.2.1v cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:*
cisco ios_xe 17.2.2 cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:*
cisco ios_xe 17.3.1 cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:*
cisco ios_xe 17.3.1a cpe:2.3:o:cisco:ios_xe:17.3.1a:*:*:*:*:*:*:*
cisco ios_xe 17.3.1w cpe:2.3:o:cisco:ios_xe:17.3.1w:*:*:*:*:*:*:*
cisco ios_xe 17.3.1x cpe:2.3:o:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:*
cisco ios_xe 17.3.2 cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:*
cisco ios_xe 17.3.2a cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:*
cisco ios_xe 17.4.1 cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:*
cisco ios_xe 17.4.1a cpe:2.3:o:cisco:ios_xe:17.4.1a:*:*:*:*:*:*:*
cisco ios_xe_sd-wan — cpe:2.3:o:cisco:ios_xe_sd-wan:*:*:*:*:*:*:*:*

References for CVE-2021-1383

cvelogic Threat Intelligence