CVE-2016-6380 — The DNS forwarder in Cisco IOS 12.0 through 12.4 and 15.0 through 15.6 and IOS XE 3.1 through 3.15 allows remote attackers to obtain sensitive information from process memory or cause a denial of service (data corruption or device reload) via a crafted DNS response, aka Bug ID CSCup90532

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HIGH

The DNS forwarder in Cisco IOS 12.0 through 12.4 and 15.0 through 15.6 and IOS XE 3.1 through 3.15 allows remote attackers to obtain sensitive information from process memory or cause a denial of service (data corruption or device reload) via a crafted DNS response, aka Bug ID CSCup90532

Published Oct 5, 2016

8.1

HIGH

CVSS 3.0

EPSS 3.01%

Description

The DNS forwarder in Cisco IOS 12.0 through 12.4 and 15.0 through 15.6 and IOS XE 3.1 through 3.15 allows remote attackers to obtain sensitive information from process memory or cause a denial of service (data corruption or device reload) via a crafted DNS response, aka Bug ID CSCup90532.

Affected products

Remediation

No remediation recorded yet.

Metrics

3.01% 0.03011

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.03011

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	3.01% (0.03011)	86.94th	v5 (v2026.06.15)
Jun 15, 2026	3.01% (0.03011)	85.63th	v5 (v2026.06.15)
Mar 30, 2025	2.27% (0.02265)	83.15th	v4 (v2025.03.14)
Mar 29, 2025	3.54% (0.03543)	79.23th	v4 (v2025.03.14)
Mar 17, 2025	2.27% (0.02265)	83.47th	v4 (v2025.03.14)
Dec 12, 2024	0.61% (0.00613)	79.40th	v3 (v2023.03.01)
Feb 8, 2024	0.61% (0.00613)	78.03th	v3 (v2023.03.01)
Mar 7, 2023	0.61% (0.00613)	75.40th	v3 (v2023.03.01)
Mar 6, 2023	1.21% (0.01213)	66.61th	v2 (v2022.01.01)
Feb 17, 2023	1.21% (0.01213)	66.22th	v2 (v2022.01.01)
Apr 1, 2022	1.21% (0.01213)	64.21th	v2 (v2022.01.01)
Feb 4, 2022	1.21% (0.01213)	40.54th	v2 (v2022.01.01)

Weaknesses (1)

CWE-20

Improper Input Validation

References (4)

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-dns
vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/93201
vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1036914
vdb-entryx_refsource_SECTRACK
https://ics-cert.us-cert.gov/advisories/ICSA-16-287-04
x_refsource_MISC

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-dns		vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/93201		vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1036914		vdb-entryx_refsource_SECTRACK
https://ics-cert.us-cert.gov/advisories/ICSA-16-287-04		x_refsource_MISC

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Oct 5, 2016

Updated Aug 6, 2024

Reserved Jul 26, 2016

Link CVE-2016-6380

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2016-6380

Red Hat

Severity n/a

Public date n/a

Links CVE-2016-6380