Buffer overflow in Cisco iOS

CVE-2002-0813

Heap-based buffer overflow in the TFTP server capability in Cisco IOS 11.1, 11.2, and 11.3 allows remote attackers to cause a denial of service (reset) or modify configuration via a long filename.

Vulnerability class: Buffer Overflow

Published 2002-08-12 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.1 (High). Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.091 (95.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.091 · newest: 0.091 · change: 0.000

Affected products

Cisco iOS — versions 11.1, 11.2, 11.3

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.iss.net/security_center/static/9700.php (vdb-entry)
marc.info/ (mailing-list)
online.securityfocus.com/archive/1/284634 (Vendor Advisory, mailing-list)
www.cisco.com/warp/public/707/ios-tftp-long-filename-pub.shtml (vendor-advisory, Patch, Vendor Advisory)
www.securityfocus.com/bid/5328 (vdb-entry)
www.osvdb.org/854 (vdb-entry)