CVE-2011-2523

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

96.18% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 99.9% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-16.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2019-11-27 20:36Z6 YR AGO

Last updated

2024-08-06 23:00Z2 YR AGO

Reserved

2011-06-15

Assigning CNA

redhat

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')Base

Data version

5.1

Document digest

659fec3a3b9f21811d6b504dda2ca45457003ce8a3081d970577004b5a7c0f18

• security-tracker.debian.orghttps://security-tracker.debian.org/tracker/CVE-2011-2523x_refsource_MISC
• access.redhat.comhttps://access.redhat.com/security/cve/cve-2011-2523x_refsource_MISC
• www.openwall.com[oss-security] 20110711 Re: vsftpd download backdooredhttps://www.openwall.com/lists/oss-security/2011/07/11/5mailing-listx_refsource_MLIST
• vigilance.frhttps://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805x_refsource_MISC
• packetstormsecurity.comhttps://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.htmlx_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.htmlx_refsource_MISC