CVE-2021-1512 | Cisco SD-WAN Software Arbitrary File Corruption Vulnerability

A vulnerability in the CLI of Cisco SD-WAN Software could allow an authenticated, local attacker to overwrite arbitrary files in the underlying file system of an affected system. This vulnerability is due to insufficient validation of the user-supplied input parameters of a specific CLI command. An attacker could exploit this vulnerability by issuing that command with specific parameters. A successful exploit could allow the attacker to overwrite the content in any arbitrary files that reside on the underlying host file system.

Published: 2021-05-06 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-1512 is rated Low Risk (28.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.23%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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

Exploit prediction scoring system (EPSS) score for CVE-2021-1512

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 0.06% 0.23% +0.17%
2 2025-03-19 0.04% 0.06% +0.02%
3 2023-03-07 — 0.04% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-1512

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:N/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:N)
Doesn’t really leak secrets in a meaningful 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 5.2 [email protected]
4.4 3.0 MEDIUM
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/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:N)
Doesn’t really leak secrets in a meaningful 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 3.6 [email protected]
3.6 2.0 LOW
AV:L/AC:L/Au:N/C:N/I:P/A:P 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:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 4.9 [email protected]

Weakness enumeration for CVE-2021-1512

Affected software / configurations for CVE-2021-1512

Vendor Product Version Raw CPE
cisco catalyst_sd-wan_manager >= 19.2, < 19.2.3 cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager >= 20.3, < 20.3.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager >= 20.4, < 20.4.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cisco catalyst_sd-wan_manager >= 20.5, < 20.5.1 cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:*
cisco sd-wan_vbond_orchestrator — cpe:2.3:a:cisco:sd-wan_vbond_orchestrator:-:*:*:*:*:*:*:*
cisco sd-wan_vmanage < 18.4.6 cpe:2.3:a:cisco:sd-wan_vmanage:*:*:*:*:*:*:*:*
cisco sd-wan_vmanage >= 20.1, < 20.1.2 cpe:2.3:a:cisco:sd-wan_vmanage:*:*:*:*:*:*:*:*
cisco vsmart_controller_firmware — cpe:2.3:o:cisco:vsmart_controller_firmware:-:*:*:*:*:*:*:*
cisco vedge_100_firmware — cpe:2.3:o:cisco:vedge_100_firmware:-:*:*:*:*:*:*:*
cisco vedge_1000_firmware — cpe:2.3:o:cisco:vedge_1000_firmware:-:*:*:*:*:*:*:*
cisco vedge_100b_firmware — cpe:2.3:o:cisco:vedge_100b_firmware:-:*:*:*:*:*:*:*
cisco vedge_100m_firmware — cpe:2.3:o:cisco:vedge_100m_firmware:-:*:*:*:*:*:*:*
cisco vedge_100wm_firmware — cpe:2.3:o:cisco:vedge_100wm_firmware:-:*:*:*:*:*:*:*
cisco vedge_2000_firmware — cpe:2.3:o:cisco:vedge_2000_firmware:-:*:*:*:*:*:*:*
cisco vedge_5000_firmware — cpe:2.3:o:cisco:vedge_5000_firmware:-:*:*:*:*:*:*:*
cisco vedge-100b_firmware — cpe:2.3:o:cisco:vedge-100b_firmware:-:*:*:*:*:*:*:*
cisco vedge_cloud_firmware — cpe:2.3:o:cisco:vedge_cloud_firmware:-:*:*:*:*:*:*:*

References for CVE-2021-1512

cvelogic Threat Intelligence