# CVE-2008-4128 — Cisco 871 Integrated Services Router **CISA KEV** > As of 2026-07-14, CVE-2008-4128 is a MEDIUM-severity vulnerability in Cisco 871 Integrated Services Router, CVSS v3.1 4.3, EPSS 12.0% (95.6th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-07-13), with a US federal remediation deadline of 2026-07-16. Threadlinqs Intelligence links 6 tracked threat campaigns to CVE-2008-4128, most recently “US Treasury Sanctions 1VPNS VPN Service and Cryptor Seller for Enabling Ransomware Operations (linked to FSB Center 16 Router Exploitation via CVE-2018-0171/CVE-2008-4128)”. **Last updated:** 2026-07-14 ## What is CVE-2008-4128? 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. The record classifies CVE-2008-4128 under weakness class [CWE-352](https://cwe.mitre.org/data/definitions/352.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 6569 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 4.3 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N`) - **EPSS (FIRST):** 12.0% probability of exploitation in the next 30 days, higher than 95.6% of all scored CVEs - **CISA KEV:** Listed since 2026-07-13, federal remediation deadline 2026-07-16 - **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9 - **Published:** 2008-09-18, last modified 2026-07-14 ## Is CVE-2008-4128 being exploited? CISA added CVE-2008-4128 to the Known Exploited Vulnerabilities catalog on 2026-07-13, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-07-16 under BOD 22-01. Weaponised exploit code for CVE-2008-4128 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 42 in the Threadlinqs vulnerability feed. - [trickest/cve](https://github.com/trickest/cve/blob/main/2008/CVE-2008-4128.md) (trickest) ## Affected products and versions - **Cisco**: Ios 12.4, 871 Integrated Services Router ## How to fix CVE-2008-4128 Because CVE-2008-4128 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-07-16. No vendor patch reference has been recorded for CVE-2008-4128 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise. ## Threat activity tracking CVE-2008-4128 6 tracked threats in the Threadlinqs corpus reference CVE-2008-4128, either in the campaign’s CVE list or as an indicator on the campaign record. - [US Treasury Sanctions 1VPNS VPN Service and Cryptor Seller for Enabling Ransomware Operations (linked to FSB Center 16 Router Exploitation via CVE-2018-0171/CVE-2008-4128)](https://intel.threadlinqs.com/threat/TL-2026-1290) — MEDIUM · 2026-07-14 - [CVE-2008-4128 — Decades-Old Cisco IOS CSRF Vulnerability Added to CISA KEV After Active Exploitation](https://intel.threadlinqs.com/threat/TL-2026-1301) — HIGH · 2026-07-14 - [FSB Center 16 (Static Tundra) Exploits SNMP Config Exfiltration and Cisco Smart Install RCE (CVE-2018-0171) Against Routers](https://intel.threadlinqs.com/threat/TL-2026-1312) — CRITICAL · 2026-07-14 - [CVE-2008-4128 Cisco IOS CSRF Vulnerability Added to CISA KEV — Exploited by Russian FSB Center 16 (Static Tundra / Berserk Bear) in Ongoing Router-Hygiene Espionage Campaign](https://intel.threadlinqs.com/threat/TL-2026-1272) — HIGH · 2026-07-13 - [Russian FSB Center 16 (Static Tundra/Berserk Bear) Exploiting Unpatched Cisco Smart Install Devices — Joint NSA/FBI/13-Nation Advisory](https://intel.threadlinqs.com/threat/TL-2026-1277) — HIGH · 2026-07-13 - [FSB Centre 16 (Berserk Bear/Energetic Bear) targets global critical national infrastructure via vulnerable routers — joint UK & allied advisory](https://intel.threadlinqs.com/threat/TL-2026-2375) — HIGH · 2026-07-13 ## Sources Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-07-14. This product uses the NVD API but is not endorsed or certified by the NVD. **Exploit and proof of concept** - [exploit-db.com — exploit](https://www.exploit-db.com/exploits/6476) - [exploit-db.com — exploit (6477)](https://www.exploit-db.com/exploits/6477) **Vulnerability database entry** - [exchange.xforce.ibmcloud.com — vdb entry](https://exchange.xforce.ibmcloud.com/vulnerabilities/45226) - [securityfocus.com — vdb entry](http://www.securityfocus.com/bid/31218) **Other references** - [jbrownsec.blogspot.com](http://jbrownsec.blogspot.com/2008/09/cisco-0day-released.html) Canonical: https://intel.threadlinqs.com/cve/CVE-2008-4128 Full detection coverage and IOCs for threats exploiting CVE-2008-4128 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp