CVE-2008-4128 — Cisco 871 Integrated Services Router

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. 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 (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) — MEDIUM · 2026-07-14
• CVE-2008-4128 — Decades-Old Cisco IOS CSRF Vulnerability Added to CISA KEV After Active Exploitation — HIGH · 2026-07-14
• FSB Center 16 (Static Tundra) Exploits SNMP Config Exfiltration and Cisco Smart Install RCE (CVE-2018-0171) Against Routers — 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 — HIGH · 2026-07-13
• Russian FSB Center 16 (Static Tundra/Berserk Bear) Exploiting Unpatched Cisco Smart Install Devices — Joint NSA/FBI/13-Nation Advisory — HIGH · 2026-07-13
• FSB Centre 16 (Berserk Bear/Energetic Bear) targets global critical national infrastructure via vulnerable routers — joint UK & allied advisory — 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
• exploit-db.com — exploit (6477)

Vulnerability database entry

• exchange.xforce.ibmcloud.com — vdb entry
• securityfocus.com — vdb entry

Other references

• jbrownsec.blogspot.com

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