Actively exploited in the wild
Cisco IOS Cross-Site Request Forgery Vulnerability
Cisco - IOS · Listed in the CISA KEV since 2026-07-13. This indicates confirmed attacks in production environments.
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CVE-2008-4128
HighCVSS 8.1KEVExploitation Probability (EPSS)
Very high risk98th percentile - higher than 98% of all known CVEs
Summary
Multiple CSRF vulnerabilities in the HTTP Administration component of Cisco IOS 12.4 on the 871 Integrated Services Router allow remote attackers to execute arbitrary commands. The attack involves requests to the /level/15/exec/- URI with the "show privilege" command and to the /level/15/exec/-/configure/http URI with the "alias exec" command.
Risk Assessment
The risk is that an attacker can gain control over the router by executing arbitrary commands, potentially leading to network integrity and data confidentiality breaches.
Recommendation
It is recommended to upgrade Cisco IOS to a patched version and implement CSRF protection mechanisms such as anti-CSRF tokens or restrict access to the HTTP administration interface.
Other vulnerabilities in Cisco IOS
See all- CVE-2016-1478High
Cisco IOS versions 15.5(3)S3, 15.6(1)S2, 15.6(2)S1, and 15.6(2)T1 improperly dequeue invalid NTP packets, allowing remote attackers to cause a denial of service (interface wedge) by sending many crafted NTP packets.
- CVE-2015-0649High
Cisco IOS versions 12.2, 12.4, 15.0, 15.2, and 15.3 allow remote attackers to cause a denial of service (device reload) via malformed Common Industrial Protocol (CIP) TCP packets.
- CVE-2015-0647High
Cisco IOS versions 12.2, 12.4, 15.0, 15.2, and 15.3 allow remote attackers to cause a denial of service (device reload) via malformed Common Industrial Protocol (CIP) UDP packets.
- CVE-2015-0638High
In Cisco IOS versions 12.2, 12.4, 15.0, 15.2, and 15.3, configuring a VRF interface allows remote attackers to cause a denial of service (interface queue wedge) via crafted ICMPv4 packets.
- CVE-2017-12238MediumActively exploited
A vulnerability in the Virtual Private LAN Service (VPLS) code of Cisco IOS 15.0 through 15.4 for Cisco Catalyst 6800 Series Switches allows an unauthenticated, adjacent attacker to crash a C6800-16P10G or C6800-16P10G-XL line card, causing a denial of service (DoS). It stems from a memory management issue; the attacker creates a large number of VPLS-generated MAC entries in the MAC address table.
- CVE-2017-12232MediumActively exploited
A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS 15.0 through 15.6 allows an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service (DoS). It is due to misclassification of Ethernet frames; the attacker sends a crafted Ethernet frame.
- CVE-2004-1464MediumActively exploited
Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.
- CVE-2000-0984Medium
The HTTP server in Cisco IOS 12.0 through 12.1 allows local users to cause a denial of service (crash and reload) via a URL containing a "?/" string.
- CVE-1999-0063Medium
Cisco IOS 12.0 and other versions can be crashed by malicious UDP packets to the syslog port.
- CVE-2025-20149Medium
A vulnerability in the CLI of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This is due to a buffer overflow, and an attacker with a low-privileged account could exploit it using crafted commands.
Original NVD description (English source)
Multiple cross-site request forgery (CSRF) vulnerabilities in the HTTP Administration component in Cisco IOS 12.4 on the 871 Integrated Services Router allow remote attackers to execute arbitrary commands via (1) a certain "show privilege" command to the /level/15/exec/- URI, and (2) a certain "alias exec" command to the /level/15/exec/-/configure/http URI. NOTE: some of these details are obtained from third party information.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS