CVE-2021-1623

FAUCET Score

CVE-2021-1623 is a denial-of-service vulnerability in Cisco cBR-8 Converged Broadband Routers, affecting the SNMP punt handling function. An authenticated, remote attacker can exploit this by sending a large volume of SNMP requests, overwhelming the device's punt path. This vulnerability has a CVSS score of 7.7 (High), indicating a low-complexity attack with high impact on availability, requiring prior authentication. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 17.6.1aCPE matchmatch criteria	cpe:2.3:o:cisco:ios_xe::::::::

CVSS Data

CVSS version used by this source: 3.1

7.7HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

Exploitability Score

3.1

Impact Score

4.0

CvssVersion

3.1

Exploit Intelligence

EPSS Score

1.10%

Probability of exploitation in next 30 days

EPSS Percentile

62.3%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0110 is in the 59th percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 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-cbr8snmp-zGjkZ9Fc

Vendor Advisory