Threat Intelligence / CVE / CVE-2011-2523

CVE-2011-2523 — vsftpd

CVSS v3.1 9.8 (CRITICAL) · EPSS 96.1% (higher than 99.8% of all scored CVEs) · Priority 10/10 · Published 2019-11-27

As of 2024-08-06, CVE-2011-2523 is a CRITICAL-severity vulnerability in vsftpd, CVSS v3.1 9.8, EPSS 96.1% (99.8th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2011-2523, most recently “VEXAIoT: Autonomous Multi-Agent LLM Framework Automates End-to-End IoT Vulnerability Discovery and Exploitation (95% Success Rate)”.

Last updated: 2024-08-06

What is CVE-2011-2523?

vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.

The record classifies CVE-2011-2523 under weakness class CWE-78. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 2492 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
96.1% probability of exploitation in the next 30 days, higher than 99.8% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
10/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2019-11-27, last modified 2024-08-06

Is CVE-2011-2523 being exploited?

Weaponised exploit code for CVE-2011-2523 is publicly available. 11 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (network/cves/2011/CVE-2011-2523.yaml).

Affected products and versions

How to fix CVE-2011-2523

No vendor patch reference has been recorded for CVE-2011-2523 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-2011-2523

1 tracked threat in the Threadlinqs corpus references CVE-2011-2523, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Mailing list and disclosure

Other references

Full detection coverage & IOCs for threats exploiting CVE-2011-2523 are available via the Threadlinqs MCP server (Purple tier). View plans →

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