CVE-2017-0176Windows Xp Buffer Overflow
A buffer overflow in Smart Card authentication code in gpkcsp.dll in Microsoft Windows XP through SP3 and Server 2003 through SP2 allows a remote attacker to execute arbitrary code on the target computer, provided that the computer is joined in a Windows domain and has Remote…
Published Jun 22, 2017 · Updated May 12, 2026
Key Facts
Patch immediately- CVE-2017-0176 is a high-severity vulnerability (CVSS 8.1 v3) affecting Windows Server 2003 (Microsoft), Windows Xp (Microsoft), Microsoft Windows Server 2003 SP1, SP2 Windows XP - SP3.
- It is exploited in the wild, listed in Industry KEV feed since Mar 12, 2025. No public exploit code is known.
- EPSS estimates a 46% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3
8.1
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
46%
Higher than 98.7% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
53/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Mar 12, 2025
2820 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
2
Reports of active use
Advisories And Exploit References
Description
A buffer overflow in Smart Card authentication code in gpkcsp.dll in Microsoft Windows XP through SP3 and Server 2003 through SP2 allows a remote attacker to execute arbitrary code on the target computer, provided that the computer is joined in a Windows domain and has Remote Desktop Protocol connectivity (or Terminal Services) enabled.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Mar 12, 2025 | n/a | Not reported |
Affected Products
7 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Server 2003Microsoft | See advisory | n/a |
| Windows XpMicrosoft | See advisory | n/a |
| Microsoft Windows Server 2003 SP1, SP2 Windows XP - SP3 | >= Microsoft Windows Server 2003 SP1, SP2 Windows XP - SP3 | n/a |
Timeline
Publicly disclosed
Jun 22, 2017
Added to Industry KEV feed
Mar 12, 2025
Last updated
May 12, 2026
Weakness Type
- CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
References
- advisory98550
- advisory98752
- patchblogs.technet.microsoft.com · protecting-customers-and-evaluating-risk
- patchsupport.microsoft.com · security-update-for-windows-xp-and-windows-serv…
- exploitblog.fortinet.com · deep-analysis-of-esteemaudit
FAQ
Common Questions.
A buffer overflow in Smart Card authentication code in gpkcsp.dll in Microsoft Windows XP through SP3 and Server 2003 through SP2 allows a remote attacker to execute arbitrary code on the target computer, provided that the computer is joined in a Windows domain and has Remote Desktop Protocol connectivity (or Terminal…
Affected: Windows Server 2003 (Microsoft); Windows Xp (Microsoft); Microsoft Windows Server 2003 SP1, SP2 Windows XP - SP3 versions >= Microsoft Windows Server 2003 SP1, SP2 Windows XP - SP3. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Mar 12, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2017-0176 On Your Attack Surface?
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