Buffer overflow in the base64 decoder in MERCUR Mailserver 4.2 before SP3a allows remote…
Priority MEDIUM 47Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
Buffer overflow in the base64 decoder in MERCUR Mailserver 4.2 before SP3a allows remote attackers to cause a denial of service and possibly execute arbitrary code via a long (1) AUTH command to the POP3 server or (2) AUTHENTICATE command to the IMAP server.
Why it matters now
EPSS 0.12925 96th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:atrium_software:mercur_mailserver:3.3:*:*:*:*:*:*:* | 3.3 | Vulnerable | Atrium Software |
| cpe:2.3:a:atrium_software:mercur_mailserver:3.3_sp1:*:*:*:*:*:*:* | 3.3_sp1 | Vulnerable | Atrium Software |
| cpe:2.3:a:atrium_software:mercur_mailserver:3.3_sp2:*:*:*:*:*:*:* | 3.3_sp2 | Vulnerable | Atrium Software |
| cpe:2.3:a:atrium_software:mercur_mailserver:4.1:*:*:*:*:*:*:* | 4.1 | Vulnerable | Atrium Software |
| cpe:2.3:a:atrium_software:mercur_mailserver:4.1_sp1:*:*:*:*:*:*:* | 4.1_sp1 | Vulnerable | Atrium Software |
| cpe:2.3:a:atrium_software:mercur_mailserver:4.2:*:*:*:*:*:*:* | 4.2 | Vulnerable | Atrium Software |
| cpe:2.3:a:atrium_software:mercur_mailserver:4.2_sp1:*:*:*:*:*:*:* | 4.2_sp1 | Vulnerable | Atrium Software |
| cpe:2.3:a:atrium_software:mercur_mailserver:4.2_sp2:*:*:*:*:*:*:* | 4.2_sp2 | Vulnerable | Atrium Software |
- cpe:2.3:a:atrium_software:mercur_mailserver:3.3:*:*:*:*:*:*:* Versions 3.3 Vulnerable ·Atrium Software
- cpe:2.3:a:atrium_software:mercur_mailserver:3.3_sp1:*:*:*:*:*:*:* Versions 3.3_sp1 Vulnerable ·Atrium Software
- cpe:2.3:a:atrium_software:mercur_mailserver:3.3_sp2:*:*:*:*:*:*:* Versions 3.3_sp2 Vulnerable ·Atrium Software
- cpe:2.3:a:atrium_software:mercur_mailserver:4.1:*:*:*:*:*:*:* Versions 4.1 Vulnerable ·Atrium Software
- cpe:2.3:a:atrium_software:mercur_mailserver:4.1_sp1:*:*:*:*:*:*:* Versions 4.1_sp1 Vulnerable ·Atrium Software
- cpe:2.3:a:atrium_software:mercur_mailserver:4.2:*:*:*:*:*:*:* Versions 4.2 Vulnerable ·Atrium Software
- cpe:2.3:a:atrium_software:mercur_mailserver:4.2_sp1:*:*:*:*:*:*:* Versions 4.2_sp1 Vulnerable ·Atrium Software
- cpe:2.3:a:atrium_software:mercur_mailserver:4.2_sp2:*:*:*:*:*:*:* Versions 4.2_sp2 Vulnerable ·Atrium Software
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2003-1177
- 2026-10-03 Alias added: GHSA-q77f-7g38-65hw
References
More Atrium Software Mercur Mailserver vulnerabilities
- TI-2003-01222 Multiple stack-based buffer overflows in Atrium MERCUR IMAPD in MERCUR Mailserver before… CVSS 2.0HIGH 10.0
- TI-2002-01045 Buffer overflow in the control service for MERCUR Mailserver 4.2 allows remote attackers… CVSS 2.0HIGH 7.5
- TI-2000-00318 Atrium Mercur Mail Server 3.2 allows local attackers to read other user's email and… CVSS 2.0HIGH 7.5
- TI-2000-00198 Buffer overflow in POP3 and IMAP servers in the MERCUR mail server suite allows remote… CVSS 2.0MEDIUM 5.0
- TI-2000-00239 Buffer overflow in the MERCUR WebView WebMail server allows remote attackers to cause a… CVSS 2.0MEDIUM 5.0
Sources
- CVE-2003-1177 · CVE Program
- CVE-2003-1177 · NVD
- FIRST EPSS
- GHSA-q77f-7g38-65hw · GitHub Advisory Database · CC BY 4.0
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