No exploitation reported

CVE-2011-3280

No exploitation reported by the sources we read.

Published2011-10-03
WeaknessCWE-399

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Memory leak in the NAT implementation in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xSG, allows remote attackers to cause a denial of service (memory consumption or device reload) by sending crafted SIP packets to UDP port 5060, aka Bug ID CSCtj04672.

Timeline

dates in UTC

2011-10-0323:55CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2011-3280?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2011-3280?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco ios

Branch	Affected	Fixed in	Source
12.1	= 12.1	no fix published	NVD
12.1	= 12.1e	no fix published	NVD
12.2	= 12.2	no fix published	NVD
12.2	= 12.2b	no fix published	NVD
12.2	= 12.2bc	no fix published	NVD
12.2	= 12.2bx	no fix published	NVD
12.2	= 12.2cx	no fix published	NVD
12.2	= 12.2cz	no fix published	NVD
12.2	= 12.2ew	no fix published	NVD
12.2	= 12.2ewa	no fix published	NVD
12.2	= 12.2ex	no fix published	NVD
12.2	= 12.2ey	no fix published	NVD

Cisco ios xe

Branch	Affected	Fixed in	Source
3.1	= 3.1.0sg	no fix published	NVD
3.1	= 3.1.1sg	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

tools.cisco.comVendor Advisory
www.cisco.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
NVDweakness (CWE)CWE-399read 2026-10-23
FIRST EPSSEPSS score1.8 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2011-10-03
Last Modified: 2026-06-16
NVD status: Modified

Frequently asked questions

What is CVE-2011-3280?

Is CVE-2011-3280 actively exploited?

Active exploitation of CVE-2011-3280 has not been confirmed. Its EPSS score was 1.8% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2011-3280?

CVE-2011-3280 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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