---
title: "CVE-2011-0657: DNSAPI.dll in the DNS client in Microsoft… | CubePath"
description: "DNSAPI.dll in the DNS client in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2…"
language: en
source: https://cubepath.com/security/cve/CVE-2011-0657
---

# CVE-2011-0657: DNSAPI.dll in the DNS client in Microsoft… | CubePath

## Description

DNSAPI.dll in the DNS client in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly process DNS queries, which allows remote attackers to execute arbitrary code via (1) a crafted LLMNR broadcast query or (2) a crafted application, aka "DNS Query Vulnerability."

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2011-0657)

## Key data

### CVSS 3.1 Critical 9.8

Score published by CISA-ADP in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

| Metric                 | Value     | What it means                                                                       |
| ---------------------- | --------- | ----------------------------------------------------------------------------------- |
| Attack vector          | Network   | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity      | Low       | No special conditions are needed. The attack can be repeated at will.               |
| Privileges required    | None      | No account or privileges are needed.                                                |
| User interaction       | None      | No action from any user is needed.                                                  |
| Scope                  | Unchanged | The impact stays within the vulnerable component.                                   |
| Confidentiality impact | High      | Serious or total effect on the secrecy of data.                                     |
| Integrity impact       | High      | Serious or total effect on the trustworthiness of data.                             |
| Availability impact    | High      | Serious or total effect on availability.                                            |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.62495 (62.5% probability)

Percentile

99.2%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA assessment as of Oct 17, 2024

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Automatable

yes

Technical impact

total

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [oval:org.mitre.oval:def:11902](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11902)  (oval.cisecurity.org) vdb-entry signature
- [TA11-102A](http://www.us-cert.gov/cas/techalerts/TA11-102A.html)  (us-cert.gov) third-party-advisory
- [1025332](http://www.securitytracker.com/id?1025332)  (securitytracker.com) vdb-entry
- [44161](http://secunia.com/advisories/44161)  (secunia.com) third-party-advisory
- [ADV-2011-0948](http://www.vupen.com/english/advisories/2011/0948)  (vupen.com) vdb-entry
- [MS11-030](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2011/ms11-030)  (docs.microsoft.com) vendor-advisory
- [47242](http://www.securityfocus.com/bid/47242)  (securityfocus.com) vdb-entry
- [71780](http://osvdb.org/71780)  (osvdb.org) vdb-entry

## Timeline

1. ID reserved Jan 28, 2011
2. Record published Apr 13, 2011
3. Record last updated Oct 17, 2024

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:58 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)