What is CVE-2009-4873?

CVE-2009-4873 is a vulnerability in Rhinosoft Serv-U, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2010-05-26.

Is CVE-2009-4873 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Rhinosoft Serv-U

CVE-2009-4873

Stack-based buffer overflow in the HTTP server in Rhino Software Serv-U Web Client 9.0.0.5 allows remote attackers to cause a denial of service (server crash) or execute arbitrary code via a long Session cookie.

Vulnerability class: Buffer Overflow

Published 2010-05-26 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 10.0 (High). Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.206 (97.4th percentile), scored 2026-09-28.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.206 · newest: 0.206 · change: 0.000

Affected products

Rhinosoft Serv-U — versions 9.0.0.5

Weakness classification (CWE)

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

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.rangos.de/ServU-ADV.txt (Exploit)
www.vupen.com/english/advisories/2009/3116 (vdb-entry, Vendor Advisory)
www.securityfocus.com/bid/36895 (Exploit, vdb-entry)
secunia.com/advisories/37228 (third-party-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2009-4873?: CVE-2009-4873 is a vulnerability in Rhinosoft Serv-U, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. Published 2010-05-26.
Is CVE-2009-4873 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.