CVE-2011-3273 — Memory leak in Cisco IOS 15.0 through 15.1, when IPS or Zone-Based Firewall (aka ZBFW) is configured, allows remote attackers to cause a denial of service (memory consumption or device crash) via vectors that trigger many session creation flows, aka Bug ID CSCti79848

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HIGH

Memory leak in Cisco IOS 15.0 through 15.1, when IPS or Zone-Based Firewall (aka ZBFW) is configured, allows remote attackers to cause a denial of service (memory consumption or device crash) via vectors that trigger many session creation flows, aka Bug ID CSCti79848

Published Oct 3, 2011

7.8

HIGH

CVSS 2.0

EPSS 1.77%

Description

Memory leak in Cisco IOS 15.0 through 15.1, when IPS or Zone-Based Firewall (aka ZBFW) is configured, allows remote attackers to cause a denial of service (memory consumption or device crash) via vectors that trigger many session creation flows, aka Bug ID CSCti79848.

Remediation

No remediation recorded yet.

Metrics

1.77% 0.01770

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

EPSS probability 0.01770

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	1.77% (0.01770)	77.32th	v5 (v2026.06.15)
Jun 15, 2026	1.77% (0.01770)	75.16th	v5 (v2026.06.15)
Mar 17, 2025	0.43% (0.00427)	60.26th	v4 (v2025.03.14)
Dec 12, 2024	0.18% (0.00181)	56.68th	v3 (v2023.03.01)
Apr 25, 2024	0.15% (0.00155)	51.19th	v3 (v2023.03.01)
Mar 15, 2024	0.14% (0.00143)	49.02th	v3 (v2023.03.01)
Feb 8, 2024	0.13% (0.00129)	46.50th	v3 (v2023.03.01)
Mar 7, 2023	0.18% (0.00181)	53.55th	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-399

References (2)

http://tools.cisco.com/security/center/viewAlert.x?alertId=24123
x_refsource_CONFIRM
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b95d57.shtml
vendor-advisoryx_refsource_CISCOVendor Advisory

Link	Providers	Tags
http://tools.cisco.com/security/center/viewAlert.x?alertId=24123		x_refsource_CONFIRM
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b95d57.shtml		vendor-advisoryx_refsource_CISCOVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Oct 3, 2011

Updated Sep 17, 2024

Reserved Aug 29, 2011

Link CVE-2011-3273

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2011-3273

Red Hat

Severity n/a

Public date n/a

Links CVE-2011-3273