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CVE-2021-1509

23
FAUCET Score

CVE-2021-1509 describes multiple vulnerabilities in Cisco SD-WAN vEdge Software that could allow a remote attacker to execute arbitrary code as root or cause a denial of service. With a CVSS score of 7.5 (High), successful exploitation requires low privileges but high attack complexity, potentially leading to full compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 20.4, < 20.4.1CPE matchmatch criteria
cpe:2.3:o:cisco:vedge_100_firmware:*:*:*:*:*:*:*:*
>= 20.5, < 20.5.1CPE matchmatch criteria
cpe:2.3:o:cisco:vedge_100_firmware:*:*:*:*:*:*:*:*
19.2.99CPE matchmatch criteria
cpe:2.3:o:cisco:vedge_100_firmware:19.2.99:*:*:*:*:*:*:*
>= 20.4, < 20.4.1CPE matchmatch criteria
cpe:2.3:o:cisco:vedge_1000_firmware:*:*:*:*:*:*:*:*
>= 20.5, < 20.5.1CPE matchmatch criteria
cpe:2.3:o:cisco:vedge_1000_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.22%
Probability of exploitation in next 30 days
EPSS Percentile
65.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0122 is in the 62nd percentile among its peer group of 1,162 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-buffover-MWGucjtO
Vendor Advisory