CVE-2006-4776

NONECVSS 0.0

0.0

Heap-based buffer overflow in the VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) allows remote attackers to execute arbitrary code via a long VLAN name in a VTP type 2 summary advertisement.

CVSS v3: —
EG Score: 0.0(none)
EPSS: 93.6%
KEV: Not listed

Published

September 14, 2006

Last Modified

April 16, 2026

References (24)

cve@mitrehttp://secunia.com/advisories/21896
cve@mitrehttp://securitytracker.com/id?1016843
cve@mitrehttp://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml
cve@mitrehttp://www.kb.cert.org/vuls/id/542108
cve@mitrehttp://www.osvdb.org/28777
cve@mitrehttp://www.phenoelit.de/stuff/CiscoVTP.txt
cve@mitrehttp://www.securityfocus.com/archive/1/445896/100/0/threaded
cve@mitrehttp://www.securityfocus.com/archive/1/445938/100/0/threaded
cve@mitrehttp://www.securityfocus.com/bid/19998
cve@mitrehttp://www.vupen.com/english/advisories/2006/3600
cve@mitrehttp://www.vupen.com/english/advisories/2006/3601
cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/28927
af854a3a-2127-422b-91ae-364da2661108http://secunia.com/advisories/21896
af854a3a-2127-422b-91ae-364da2661108http://securitytracker.com/id?1016843
af854a3a-2127-422b-91ae-364da2661108http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-119Buffer Operations Within Bounds (Buffer Overflow)

Data Freshness Timeline

(refreshed 5× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-15 17:44 UTCEPSS rescore
2026-06-14 23:13 UTCEPSS rescore
2026-06-13 22:57 UTCEPSS rescore
2026-06-13 22:57 UTCEPSS rescore
2026-06-12 23:08 UTCEPSS rescore
2026-06-08 14:13 UTCEPSS rescore
2026-06-07 15:21 UTCEPSS rescore
2026-06-07 15:21 UTCEPSS rescore
2026-06-06 13:44 UTCEPSS rescore
2026-06-06 13:44 UTCEPSS rescore
2026-06-05 22:44 UTCEPSS rescore
2026-06-05 22:44 UTCEPSS rescore
2026-06-05 06:07 UTCEPSS rescore
2026-06-04 13:09 UTCEPSS rescore
2026-06-04 13:09 UTCEPSS rescore
2026-06-02 20:10 UTCEPSS rescore
2026-06-02 20:10 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-06-01 13:49 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 22:28 UTCEPSS rescore
2026-05-31 06:48 UTCEG score recompute
2026-05-31 06:48 UTCGHSA enrichment
2026-05-31 00:13 UTCEPSS rescore
2026-05-31 00:13 UTCEPSS rescore

Show 19 more

2026-05-29 13:40 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
2026-05-27 13:37 UTCEPSS rescore
2026-05-27 13:37 UTCEPSS rescore
2026-05-26 13:41 UTCEPSS rescore
2026-05-26 13:41 UTCEPSS rescore
2026-05-26 07:16 UTCEPSS rescore
2026-05-26 07:16 UTCEPSS rescore
2026-05-26 07:16 UTCEPSS rescore
2026-05-22 21:15 UTCEPSS rescore
2026-05-22 21:15 UTCEPSS rescore
2026-05-22 21:15 UTCEPSS rescore
2026-05-21 22:38 UTCEPSS rescore
2026-05-20 22:36 UTCEPSS rescore
2026-05-20 11:20 UTCEPSS rescore
2026-05-20 11:20 UTCEPSS rescore
2026-05-18 21:29 UTCEPSS rescore
2026-05-18 21:29 UTCEPSS rescore

Frequently asked(4)

What is CVE-2006-4776?

CVE-2006-4776 is a none vulnerability published on September 14, 2006. Heap-based buffer overflow in the VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) allows remote attackers to execute arbitrary code via a long VLAN name in a VTP type 2 summary advertisement.

When was CVE-2006-4776 disclosed?

CVE-2006-4776 was first published in the National Vulnerability Database on September 14, 2006, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2006-4776 actively exploited?

CVE-2006-4776 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2006-4776?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2006-4776, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2006-4776

📅 Published

🔄 Last Modified

🔗 References (24)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2006-4776?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (24)

Frequently asked(4)

Related CVEs(same CWE)