CVE-2013-6686 — The SSL VPN implementation in Cisco IOS 15.3(1)T2 and earlier allows remote authenticated users to cause a denial of service (interface queue wedge) via crafted DTLS packets in an SSL session, aka Bug IDs CSCuh97409 and CSCud90568

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MEDIUM

The SSL VPN implementation in Cisco IOS 15.3(1)T2 and earlier allows remote authenticated users to cause a denial of service (interface queue wedge) via crafted DTLS packets in an SSL session, aka Bug IDs CSCuh97409 and CSCud90568

Published Nov 16, 2013

6.8

MEDIUM

CVSS 2.0

EPSS 1.50%

Description

The SSL VPN implementation in Cisco IOS 15.3(1)T2 and earlier allows remote authenticated users to cause a denial of service (interface queue wedge) via crafted DTLS packets in an SSL session, aka Bug IDs CSCuh97409 and CSCud90568.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.50% 0.01498

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

EPSS probability 0.01498

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 (11 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	1.50% (0.01498)	73.30th	v5 (v2026.06.15)
Jun 15, 2026	1.50% (0.01498)	70.80th	v5 (v2026.06.15)
Mar 17, 2025	0.32% (0.00316)	52.48th	v4 (v2025.03.14)
Dec 12, 2024	0.11% (0.00112)	46.25th	v3 (v2023.03.01)
Apr 25, 2024	0.11% (0.00114)	44.29th	v3 (v2023.03.01)
Feb 8, 2024	0.09% (0.00093)	38.05th	v3 (v2023.03.01)
Mar 7, 2023	0.11% (0.00112)	42.88th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)

Weaknesses (1)

CWE-20

Improper Input Validation

References (2)

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6686
vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=31757
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6686		vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=31757		x_refsource_CONFIRMVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Nov 16, 2013

Updated Sep 17, 2024

Reserved Nov 7, 2013

Link CVE-2013-6686

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2013-6686

Red Hat

Severity n/a

Public date n/a

Links CVE-2013-6686