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CVE-2021-1300

30
FAUCET Score

CVE-2021-1300 describes multiple critical vulnerabilities in Cisco SD-WAN products, allowing unauthenticated, remote attackers to execute various attacks. With a CVSS score of 9.8 (CRITICAL), these vulnerabilities are easily exploitable over the network with low complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. While not currently listed in CISA's KEV catalog or having public exploit code in Metasploit or ExploitDB, the vulnerability has garnered significant community discussion and media coverage, indicating high awareness.

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
2.13%
Probability of exploitation in next 30 days
EPSS Percentile
80.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0213 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

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