CVE-2025-53797VulnerabilityPublished 9 Sep 2025Updated 20 Feb 2026

CVE-2025-53797: 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 25 Oct 2026, 19:02 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 2026-10-25.

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.

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

1. Apply official security patches from Microsoft as soon as they become available for Windows Server 2008 R2 SP1 to address this vulnerability. 2. If patches are not yet released, consider disabling or restricting the RRAS service, especially on servers exposed to untrusted networks. 3. Implement network segmentation and firewall rules to limit access to RRAS ports and services only to trusted hosts and networks. 4. Monitor network traffic for unusual or malformed packets targeting RRAS to detect potential exploitation attempts. 5. Employ intrusion detection/prevention systems (IDS/IPS) with updated signatures that can identify attempts to exploit buffer over-read conditions in RRAS. 6. Evaluate the feasibility of upgrading legacy Windows Server 2008 R2 systems to supported versions with ongoing security updates to reduce exposure to known vulnerabilities. 7. Conduct regular security audits and vulnerability scans focusing on RRAS and related network services to identify and remediate misconfigurations. 8. Educate system administrators about the risks of exposing RRAS services and the importance of applying security updates promptly.

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-2025-53797 is unauthorized disclosure of sensitive information from the affected Windows Server 2008 R2 systems running RRAS. This can lead to leakage of network configuration details, routing tables, or other memory-resident data that could assist attackers in mapping internal networks or crafting subsequent attacks. Although the vulnerability does not directly compromise system integrity or availability, the confidentiality breach can have significant consequences in environments where RRAS is used to manage critical network access or VPN connections. Organizations relying on legacy Windows Server 2008 R2 systems, especially those exposing RRAS services to untrusted networks, face increased risk of information leakage. This could facilitate targeted attacks, lateral movement, or privilege escalation attempts. The medium severity rating reflects the moderate risk level, but the lack of authentication requirement and network attack vector increase the urgency for mitigation. The impact is more pronounced in sectors with sensitive data or critical infrastructure, where network topology disclosure can aid adversaries. Since no known exploits are currently in the wild, proactive mitigation can effectively reduce risk before exploitation becomes widespread.

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-2025-53797 (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, 21:16 UTC

WeaknessesCWE-126

Technical details

References

Community reviews

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