CRITICAL
vsftpd: backdoor which opens a shell on port 6200/tcp
Published Nov 27, 2019
9.8
CRITICALCVSS 3.1
EPSS 96.18%
Description
vsftpd 2.3.4 downloaded between 20110630 and 20110703 contains a backdoor which opens a shell on port 6200/tcp.
Affected products
-
- Version 2.3.4 downloaded between 20110630 and 20110703StatusaffectedConstraints-
- Version
Configuration 1
- 2.3.4
Configuration 2
OR
- 8.0
- 9.0
- 10.0
No data.
Red Hat Enterprise Linux 5
vsftpd
Not affected
Red Hat Enterprise Linux 6
vsftpd
Not affected
Red Hat Enterprise Linux 7
vsftpd
Not affected
Red Hat Enterprise Linux 8
vsftpd
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | vsftpd | Not affected | n/a |
| Red Hat Enterprise Linux 6 | vsftpd | Not affected | n/a |
| Red Hat Enterprise Linux 7 | vsftpd | Not affected | n/a |
| Red Hat Enterprise Linux 8 | vsftpd | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of vsftpd as shipped with Red Hat Enterprise Linux 3, 4, 5, or 6.
Metrics
No CVSS v4.0 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
8.1 HIGH Red Hat
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
10.0 HIGH NVD
AV:N/AC:L/Au:N/C:C/I:C/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
96.18% 0.96184
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.96184
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (29 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 96.18% (0.96184) | 99.88th | v5 (v2026.06.15) |
| Jun 15, 2026 | 96.18% (0.96184) | 99.87th | v5 (v2026.06.15) |
| Mar 17, 2025 | 94.26% (0.94261) | 99.92th | v4 (v2025.03.14) |
| Mar 7, 2025 | 39.50% (0.39495) | 97.39th | v3 (v2023.03.01) |
| Jan 13, 2025 | 50.35% (0.50348) | 97.64th | v3 (v2023.03.01) |
| Dec 25, 2024 | 58.35% (0.58351) | 97.86th | v3 (v2023.03.01) |
| Dec 17, 2024 | 65.70% (0.65699) | 98.07th | v3 (v2023.03.01) |
| Dec 8, 2024 | 80.46% (0.80460) | 98.44th | v3 (v2023.03.01) |
| Nov 20, 2024 | 84.23% (0.84229) | 98.59th | v3 (v2023.03.01) |
| Nov 5, 2024 | 85.73% (0.85727) | 98.65th | v3 (v2023.03.01) |
| Oct 18, 2024 | 86.82% (0.86820) | 98.69th | v3 (v2023.03.01) |
| Jun 22, 2024 | 88.31% (0.88312) | 98.71th | v3 (v2023.03.01) |
| Jun 9, 2024 | 88.22% (0.88222) | 98.69th | v3 (v2023.03.01) |
| Apr 24, 2024 | 85.86% (0.85861) | 98.52th | v3 (v2023.03.01) |
| Mar 22, 2024 | 84.21% (0.84215) | 98.40th | v3 (v2023.03.01) |
| Mar 7, 2024 | 83.23% (0.83232) | 98.34th | v3 (v2023.03.01) |
| Feb 22, 2024 | 86.29% (0.86290) | 98.48th | v3 (v2023.03.01) |
| Nov 3, 2023 | 88.34% (0.88342) | 98.35th | v3 (v2023.03.01) |
| Sep 16, 2023 | 87.85% (0.87852) | 98.25th | v3 (v2023.03.01) |
| Aug 14, 2023 | 87.76% (0.87759) | 98.21th | v3 (v2023.03.01) |
| Jul 27, 2023 | 86.93% (0.86927) | 98.15th | v3 (v2023.03.01) |
| Jun 24, 2023 | 87.24% (0.87236) | 98.13th | v3 (v2023.03.01) |
| Jun 6, 2023 | 92.53% (0.92535) | 98.50th | v3 (v2023.03.01) |
| Apr 16, 2023 | 93.17% (0.93168) | 98.52th | v3 (v2023.03.01) |
| Mar 7, 2023 | 92.10% (0.92101) | 98.35th | v3 (v2023.03.01) |
| Mar 6, 2023 | 46.67% (0.46671) | 98.43th | v2 (v2022.01.01) |
| Nov 15, 2022 | 30.49% (0.30487) | 97.43th | v2 (v2022.01.01) |
| Jul 15, 2022 | 12.30% (0.12300) | 95.08th | v2 (v2022.01.01) |
| Feb 4, 2022 | 30.49% (0.30487) | 96.34th | v2 (v2022.01.01) |
Weaknesses (1)
References (10)
- http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2011-2523 Vendor Advisory
- https://access.redhat.com/security/cve/cve-2011-2523 x_refsource_MISCThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1778781 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-2523
- https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html x_refsource_MISCExploitThird Party AdvisoryVDB Entry
- https://security-tracker.debian.org/tracker/CVE-2011-2523 x_refsource_MISCThird Party Advisory
- https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805 x_refsource_MISCThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2011-2523
- https://www.openwall.com/lists/oss-security/2011/07/11/5 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| http://packetstormsecurity.com/files/162145/vsftpd-2.3.4-Backdoor-Command-Execution.html | x_refsource_MISC | |
| https://access.redhat.com/security/cve/CVE-2011-2523 | Vendor Advisory | |
| https://access.redhat.com/security/cve/cve-2011-2523 | x_refsource_MISCThird Party Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1778781 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-2523 | ||
| https://packetstormsecurity.com/files/102745/VSFTPD-2.3.4-Backdoor-Command-Execution.html | x_refsource_MISCExploitThird Party AdvisoryVDB Entry | |
| https://security-tracker.debian.org/tracker/CVE-2011-2523 | x_refsource_MISCThird Party Advisory | |
| https://vigilance.fr/vulnerability/vsftpd-backdoor-in-version-2-3-4-10805 | x_refsource_MISCThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2011-2523 | ||
| https://www.openwall.com/lists/oss-security/2011/07/11/5 | mailing-listx_refsource_MLISTMailing ListThird Party Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Nov 27, 2019
Updated Aug 6, 2024
Reserved Jun 15, 2011
Link CVE-2011-2523
CISA Vulnrichment
Updated n/a