- Description
- A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition in the Cisco AnyConnect service on an affected device. This vulnerability is due to variable initialization errors when an SSL VPN session is established. An attacker could exploit this vulnerability by sending a sequence of crafted HTTPS requests to an affected device. A successful exploit could allow the attacker to cause the Cisco AnyConnect VPN server to restart, resulting in the failure of all established SSL VPN sessions and forcing remote users to initiate a new VPN connection and re-authenticate. A sustained attack could prevent new SSL VPN connections from being established, effectively making the Cisco AnyConnect VPN service unavailable for all legitimate users.
- Source
- psirt@cisco.com
- NVD status
- Awaiting Analysis
CVSS 3.1
- Type
- Primary
- Base score
- 8.6
- Impact score
- 4
- Exploitability score
- 3.9
- Vector string
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- Severity
- HIGH
- psirt@cisco.com
- CWE-457
- Hype score
- Not currently trending
⚠️Vulnerabilidad corregida en productos de Cisco ❗CVE-2025-20271 ➡️Más info: https://t.co/t47aeS2bYM https://t.co/6q0A89RkQB
@CERTpy
24 Jun 2025
170 Impressions
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⚠️Vulnerabilidad corregida en productos de Cisco ❗CVE-2025-20271 ➡️Más info: https://t.co/KnBMFFbcEG https://t.co/bx2nCDYFuz
@CERTpy
23 Jun 2025
157 Impressions
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CVE-2025-20271 (CVSS:8.6, HIGH) is Received. A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devic..https://t.co/S0UeNa6EoX #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre
@cracbot
23 Jun 2025
13 Impressions
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Actively exploited CVE : CVE-2025-20271
@transilienceai
22 Jun 2025
16 Impressions
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1 Reply
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Actively exploited CVE : CVE-2025-20271
@transilienceai
21 Jun 2025
21 Impressions
0 Retweets
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1 Reply
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Cisco Meraki MX and Z Series AnyConnect VPN Authentication Denial of Service Vulnerability (CVE-2025-20271) #Cisco #CiscoMeraki #CVE202520271 #CyberSecurity https://t.co/kEsvJaC8Nk https://t.co/EeWgmiXuDI
@SystemTek_UK
19 Jun 2025
58 Impressions
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CVE-2025-20271 A vulnerability in the Cisco AnyConnect VPN server of Cisco Meraki MX and Cisco Meraki Z Series Teleworker Gateway devices could allow an unauthenticated, remote atta… https://t.co/ztKv8ubiFl
@CVEnew
19 Jun 2025
135 Impressions
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High-Severity Vulnerabilities Patched by Cisco and Atlassian Cisco and Atlassian have released patches addressing multiple high-severity vulnerabilities that could lead to denial-of-service (DoS) conditions. Cisco fixed CVE-2025-20271 (CVSS 8.6), a remotely exploitable bug in ht
@dCypherIO
19 Jun 2025
34 Impressions
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