CVE-2017-6721

Name: CVE-2017-6721
Creator: NVD / NIST
Published: 2017-07-04T00:29:00.68+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.20%

Last modified Jun 17, 2026

CVE-2017-6721 is a vulnerability of currently unknown severity. A vulnerability in the ingress processing of fragmented TCP packets by Cisco Wide Area Application Services (WAAS) could allow an unauthenticated, remote attacker to cause the WAASNET process to restart unexpectedly, causing a denial of service (DoS) condition. More Information: CSCvc57428. EPSS estimates a 2.20% chance of exploitation in the next 30 days.

Description

A vulnerability in the ingress processing of fragmented TCP packets by Cisco Wide Area Application Services (WAAS) could allow an unauthenticated, remote attacker to cause the WAASNET process to restart unexpectedly, causing a denial of service (DoS) condition. More Information: CSCvc57428. Known Affected Releases: 6.3(1). Known Fixed Releases: 6.3(0.143) 6.2(3c)6 6.2(3.22).

Metrics

EPSS Probability

2.20%

80.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Cisco	Wide Area Application Services	6.3\(1\)

References

http://www.securityfocus.com/bid/99200Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038747Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-waasVendor Advisory
http://www.securityfocus.com/bid/99200Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038747Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-waasVendor Advisory

Timeline

Published: Jul 4, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-6721?

How severe is CVE-2017-6721?

Severity scoring for CVE-2017-6721 is pending analysis. The EPSS model estimates a 2.20% probability of exploitation in the next 30 days.

How do I fix CVE-2017-6721?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-6721?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST