Report · SecurityWeekAbout CVE-2025-10547Published 3 Oct 2025

Unauthenticated RCE Flaw Patched in DrayTek Routers

Source SecurityWeek

Authoritative record:CVE-2025-10547· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical.

Data as of 26 Oct 2026, 15:59 UTC

CVSS 3.1 base score

9.8Critical

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

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

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

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: None: The vulnerable system can be exploited without any interaction from any user.
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: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Oct 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 26 Oct 2026.

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 or the CVSS exploit maturity 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

AI-suggested

European organizations should immediately identify all DrayTek Vigor routers in their environment and apply the official firmware updates released by DrayTek to remediate CVE-2025-10547. If immediate patching is not feasible, organizations should disable remote access to the router’s WebUI and SSL VPN services to prevent WAN-based exploitation. Implement strict Access Control Lists (ACLs) to restrict access to the WebUI only to trusted IP addresses. For local network protection, segment the network using VLANs to isolate management interfaces and restrict access to the router’s WebUI. Monitor network traffic for unusual HTTP/S requests targeting router management interfaces, and deploy intrusion detection/prevention systems capable of detecting exploitation attempts. Regularly audit router configurations to ensure security best practices are enforced. Educate IT staff about the vulnerability and the importance of timely patching. Additionally, consider deploying network-level protections such as firewall rules to limit access to router management ports and implement multi-factor authentication where supported. Finally, maintain up-to-date asset inventories to quickly identify vulnerable devices in the future.

Description

A critical unauthenticated remote code execution (RCE) vulnerability (CVE-2025-10547) was discovered and patched in DrayTek Vigor routers. The flaw can be exploited remotely via crafted HTTP/S requests to the device's web user interface, potentially causing memory corruption, system crashes, and arbitrary code execution without authentication. While remote WAN attacks can be mitigated by disabling remote WebUI and SSL VPN access or configuring ACLs, local network attackers may still exploit the vulnerability. DrayTek has released patches for 35 router models and urges immediate updates. The routers are widely used by prosumers and SMBs, making this a significant risk, especially given past ransomware campaigns targeting DrayTek devices. No exploitation in the wild has been reported yet, but the ease of exploitation and impact potential warrant urgent attention from European organizations using these routers.

Impact

For European organizations, the impact of this vulnerability could be significant, especially for SMBs and prosumers relying on DrayTek Vigor routers for network connectivity. Exploitation could lead to denial of service via router crashes, disrupting internet access and business operations. More critically, arbitrary code execution could allow attackers to implant malware, intercept or manipulate network traffic, and pivot into internal networks, potentially leading to data breaches or ransomware infections. Given DrayTek’s popularity in Europe, especially among SMBs that may lack robust network segmentation and monitoring, the risk of lateral movement and persistent compromise is elevated. Disruption of critical business functions or exposure of sensitive data could result in financial losses, reputational damage, and regulatory penalties under GDPR. The vulnerability also poses risks to managed service providers and enterprises that use these routers in branch offices or remote sites. Although no exploitation in the wild is reported yet, the ease of exploitation and unauthenticated nature make it a prime target for opportunistic attackers and automated scanning campaigns.

References

securityweek.com/unauthenticated-rce-flaw-patched-in-draytek-routers/ (opens in a new tab)

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