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CVE-2021-1301

31
FAUCET Score

CVE-2021-1301 describes multiple critical vulnerabilities in Cisco SD-WAN products that could allow an unauthenticated, remote attacker to execute arbitrary attacks. With a CVSS score of 9.8, these vulnerabilities are highly severe, requiring no user interaction and potentially leading to complete compromise of confidentiality, integrity, and availability. Despite its critical severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe_sd-wan:-:*:*:*:*:*:*:*
18.3.8CPE matchmatch criteria
cpe:2.3:o:cisco:sd-wan_firmware:18.3.8:*:*:*:*:*:*:*
18.4.4CPE matchmatch criteria
cpe:2.3:o:cisco:sd-wan_firmware:18.4.4:*:*:*:*:*:*:*
19.2.1CPE matchmatch criteria
cpe:2.3:o:cisco:sd-wan_firmware:19.2.1:*:*:*:*:*:*:*
19.2.99CPE matchmatch criteria
cpe:2.3:o:cisco:sd-wan_firmware:19.2.99:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.10%
Probability of exploitation in next 30 days
EPSS Percentile
79.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0210 is in the 69th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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-bufovulns-B5NrSHbj
Vendor Advisory