# CVE-2016-11021

**CISA KEV**

> As of 2025-10-21, CVE-2016-11021 is a HIGH-severity vulnerability, CVSS v3.1 7.2, EPSS 68.8% (99.3th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), with a US federal remediation deadline of 2022-04-15. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2016-11021, most recently “TuxBot v3 Evolution: LLM-Assisted IoT Botnet Framework With a Broken Multi-CVE Exploit Chain”.

**Last updated:** 2025-10-21

## What is CVE-2016-11021?

setSystemCommand on D-Link DCS-930L devices before 2.12 allows a remote attacker to execute code via an OS command in the SystemCommand parameter.

The record classifies CVE-2016-11021 under weakness class [CWE-78](https://intel.threadlinqs.com/cwe/CWE-78). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs high-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. The identifier was first published 2424 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.2 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 68.8% probability of exploitation in the next 30 days, higher than 99.3% of all scored CVEs
- **CISA KEV:** Listed since 2022-03-25, federal remediation deadline 2022-04-15
- **Threadlinqs priority:** 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- **Published:** 2020-03-09, last modified 2025-10-21

## Is CVE-2016-11021 being exploited?

CISA added CVE-2016-11021 to the Known Exploited Vulnerabilities catalog on 2022-03-25, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2022-04-15 under BOD 22-01. Weaponised exploit code for CVE-2016-11021 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 48 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2016/CVE-2016-11021.md) (trickest)

## Affected products and versions

No affected-product or package list has been recorded for CVE-2016-11021 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

## How to fix CVE-2016-11021

Because CVE-2016-11021 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2022-04-15. No vendor patch reference has been recorded for CVE-2016-11021 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2016-11021

1 tracked threat in the Threadlinqs corpus references CVE-2016-11021, either in the campaign’s CVE list or as an indicator on the campaign record.

- [TuxBot v3 Evolution: LLM-Assisted IoT Botnet Framework With a Broken Multi-CVE Exploit Chain](https://intel.threadlinqs.com/threat/TL-2026-1366) — HIGH · 2026-07-15

## Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Other references**

- [exploit-db.com](https://www.exploit-db.com/exploits/39437)

Canonical: https://intel.threadlinqs.com/cve/CVE-2016-11021
Full detection coverage and IOCs for threats exploiting CVE-2016-11021 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp