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CVE-2021-1273

27
FAUCET Score

CVE-2021-1273 describes multiple vulnerabilities in Cisco SD-WAN products that could allow an unauthenticated, remote attacker to launch denial of service (DoS) attacks. With a CVSS score of 8.6 (High), these vulnerabilities are easily exploitable over the network with low attack complexity, potentially leading to a complete loss of availability for affected devices. There is currently no evidence of active exploitation, nor are there public exploit codes or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:cisco:ios_xe_sd-wan:-:*:*:*:*:*:*:*
18.3.5CPE matchmatch criteria
cpe:2.3:o:cisco:sd-wan_firmware:18.3.5:*:*:*:*:*:*:*
18.3.8CPE matchmatch criteria
cpe:2.3:o:cisco:sd-wan_firmware:18.3.8:*:*:*:*:*:*:*
18.4.1CPE matchmatch criteria
cpe:2.3:o:cisco:sd-wan_firmware:18.4.1:*:*:*:*:*:*:*
18.4.4CPE matchmatch criteria
cpe:2.3:o:cisco:sd-wan_firmware:18.4.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.6HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.39%
Probability of exploitation in next 30 days
EPSS Percentile
69.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0138 is in the 50th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 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-dosmulti-48jJuEUP
Vendor Advisory