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CVE-2015-6321

HIGH · CVSS 7.8EPSS 2.8%EU EUVD

Cisco AsyncOS before 8.5.7-042, 9.x before 9.1.0-032, 9.1.x before 9.1.1-023, and 9.5.x and 9.6.x before 9.6.0-042 on Email Security Appliance (ESA) devices; before 9.1.0-032, 9.1.1 before 9.1.1-005, and 9.5.x before 9.5.0-025 on Content Security Management Appliance (SMA) devices; and before 7.7.0-725 and 8.x before 8.0.8-113 on Web Security Appliance (WSA) devices allows remote attackers to cause a denial of service (memory consumption) via a flood of TCP packets, aka Bug IDs CSCus79774, CSCus79777, and CSCzv95795.

Key facts

CVSS score
7.8 (v2.0)
Severity
HIGH
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:C
Weakness (CWE)
CWE-399
EPSS score
2.8% (86th percentile)
In CISA KEV
No
In EU EUVD
Yes (EUVD-2015-6263)
Published
November 6, 2015
NVD last modified
June 17, 2026
Status
Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2015-6263 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / content security management appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / email security appliance
  • cisco / web security appliance
  • cisco / web security appliance
  • cisco / web security appliance
  • cisco / web security appliance
  • cisco / web security appliance
  • cisco / web security appliance
  • cisco / web security appliance
  • cisco / web security appliance
  • cisco / web security appliance
  • cisco / web security appliance

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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CVE-2015-6321: HIGH severity (CVSS 7.8)