CVE-2003-0266: Multiple buffer overflows in SLWebMail 3 on Windows systems allows remote attackers to cause a denial of servi

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HIGH 7.5DOWNGRADE

CVE-2003-0266 is a high-severity flaw (CVSS 7.5) affecting slwebmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple buffer overflows in SLWebMail 3 on Windows systems allows remote attackers to cause a denial of service and possibly execute arbitrary code via (1) a long Language parameter to showlogin.dll, (2) a long CompanyID parameter to recman.dll, (3) a long CompanyID parameter to admin.dll, or (4) a long CompanyID parameter to globallogin.dll.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Published	2003-05-27
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: bvrp software

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2003-05-27 04:00 UTCPublished CVE record published
2026-06-16 22:01 UTCUpdated Record last modified

bvrp software slwebmail DOWNGRADE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

1. Check installed version

apt-cache policy slwebmail || rpm -q slwebmail || slwebmail --version

2. No fixed release: DOWNGRADE to a release before 3.0 (Debian / Ubuntu)

apt-cache madison slwebmail sudo apt install slwebmail=<VERSION_BEFORE_3.0> sudo apt-mark hold slwebmail

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list slwebmail sudo dnf downgrade slwebmail-<VERSION_BEFORE_3.0> sudo dnf versionlock add slwebmail

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2003-0266?

slwebmail: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2003-0266 being exploited?

CVE-2003-0266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2003-0266 affect?

CVE-2003-0266 affects slwebmail. Severity is high (CVSS 7.5). Multiple buffer overflows in SLWebMail 3 on Windows systems allows remote attackers to cause a denial of service and possibly execute arbitrary code via (1) a long Language parameter to showlogin.dll, (2) a long CompanyID parameter to recma

How urgent is CVE-2003-0266?

Priority 48/100. High severity

Software pages

Windows vulnerabilities

Related CVEs

CVE-2003-0268 MEDIUM 5.0 DOWNGRADE SLWebMail 3 on Windows systems allows remote attackers to identify the full path of the server via invalid req
CVE-2003-0267 MEDIUM 5.0 DOWNGRADE ShowGodLog.dll in SLWebMail 3 on Windows systems allows remote attackers to read arbitrary files by directly c

References

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