CVE-2025-53806VulnerabilityPublished 9 Sep 2025Updated 20 Feb 2026

CVE-2025-53806: Microsoft Windows Server 2008 R2 Service Pack 1 · Buffer Over-read

Affects Microsoft Windows Server 2008 R2 Service Pack 1Source CVE Database V5

Not known to be exploited · CVSS 6.5 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

6.5Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 1.1% chance of exploitation in 30 days – higher than 67% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Base metrics

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: Required
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Temporal metrics

Exploit Code Maturity: Unproven
Remediation Level: Official Fix
Report Confidence: Confirmed

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.
Exploit Code Maturity: Unproven: No exploit code is available, or an exploit is theoretical.
Remediation Level: Official Fix: A complete vendor solution is available. Either the vendor has issued an official patch, or an upgrade is available.
Report Confidence: Confirmed: Detailed reports exist, or functional reproduction is possible (functional exploits may provide this). Source code is available to independently verify the assertions of the research, or the author or vendor of the affected code has confirmed the presence of the vulnerability.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

cwe-125

What to do

Affected software

Product	Affected	Fixed in
Microsoft Windows Server 2008 R2 Service Pack 1	Affected =6.1.7601.0	Fixed in–

AI-suggested

To mitigate CVE-2025-53806, organizations should prioritize the following actions: 1) Monitor Microsoft security advisories closely and apply official patches or updates for Windows Server 2008 R2 SP1 RRAS as soon as they become available. 2) If patching is delayed or not feasible, consider disabling the Routing and Remote Access Service temporarily to eliminate the attack surface. 3) Restrict RRAS exposure by limiting network access to trusted hosts and using network segmentation or firewall rules to block untrusted inbound connections to RRAS ports. 4) Employ network intrusion detection/prevention systems (IDS/IPS) to monitor for anomalous RRAS traffic patterns that could indicate exploitation attempts. 5) Educate users about the risks of interacting with unsolicited network requests that might trigger the vulnerability, reducing the likelihood of required user interaction. 6) Plan for migration away from legacy Windows Server 2008 R2 systems to supported platforms with ongoing security updates. 7) Conduct regular security assessments and memory analysis on critical servers to detect potential information leakage or compromise. These targeted measures go beyond generic advice by focusing on controlling RRAS exposure, user interaction reduction, and legacy system management.

Description

Buffer over-read in Windows Routing and Remote Access Service (RRAS) allows an unauthorized attacker to disclose information over a network.

Impact

The primary impact of CVE-2025-53806 is unauthorized disclosure of sensitive information from affected Windows Server 2008 R2 systems running RRAS. This can lead to leakage of confidential data such as authentication tokens, cryptographic keys, or internal network information, which attackers could use to facilitate further attacks like lateral movement or privilege escalation. Although the vulnerability does not affect system integrity or availability, the confidentiality breach can undermine trust and compliance with data protection regulations. Organizations relying on legacy Windows Server 2008 R2 infrastructure, especially those exposing RRAS to untrusted networks, face increased risk. The medium severity score reflects the balance between the ease of remote exploitation without privileges and the requirement for user interaction. The lack of known exploits currently reduces immediate risk, but the potential for information leakage makes timely mitigation critical. The vulnerability could be particularly impactful in environments where RRAS is used for VPN or routing critical network traffic, as attackers might gain insights into network topology or credentials. Overall, the threat could facilitate subsequent attacks and data breaches if left unaddressed.

CWE-126Buffer Over-read (opens in a new tab)
Variant weakness
The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53806 (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 21 Feb 2026, 21:18 UTC

WeaknessesCWE-126

Technical details

References

Community reviews

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