Cisco SD-WAN Software Arbitrary File Corruption Vulnerability

published 2021-05-06 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-6979

cvss: 4.4; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

cisco catalyst_sd-wan_manager 19.2.3, 20.3.1, 20.4.1, 20.5.1
cisco sd-wan_vmanage 18.4.6, 20.1.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-11-08)

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	4.4	CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
NVD	3.1	6.0	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
NVD	2.0	3.6	AV:L/AC:L/Au:N/C:N/I:P/A:P

Affected products

Cisco Cisco SD-WAN Solution

Classification

Weakness

CWE-552 Files or Directories Accessible to External Parties

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-arbfile-7Qhd9mCn
vendor-advisory

Sources

CVE List CVE-2021-1512
NVD CVE-2021-1512

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary