Security readout for executives and security teams
Plain-English summary
EasyFTP Server up to 1.7.0.11 has a remotely reachable memory corruption flaw in its FTP directory-change handling. An unauthenticated attacker could potentially take control of the server process. The product is old and may now appear as UplusFtp, so the main business risk is forgotten legacy FTP exposure.
Executive priority
Treat as urgent for any reachable legacy FTP service. The combination of unauthenticated remote code execution, critical score, and public exploit references warrants rapid inventory and containment, even without KEV-confirmed active exploitation.
Technical view
The issue is a CWE-121 stack-based buffer overflow in the FTP CWD command parser. The source bundle rates it CVSS 4.0 9.3, network exploitable, low complexity, no privileges, and no user interaction. The bundle states the issue was fixed in version 1.7.0.12.
Likely exposure
Exposure is most likely in legacy Windows environments still running EasyFTP Server 1.7.0.11 or earlier, especially where FTP is reachable from untrusted networks. Because the product was renamed UplusFtp, inventory should check both names.
Exploitation context
The bundle cites public exploit and technical references, including Bugtraq, Metasploit, Exploit-DB, and a technical blog. CISA KEV status is false in the bundle, so there is no provided evidence of active exploitation.
Researcher notes
The source bundle contains an apparent affected-product inconsistency: the narrative names EasyFTP Server through 1.7.0.11, while the affected object lists version 0 with defaultStatus unaffected. Use vendor/version evidence from the advisory sources before final scoping decisions.
Mitigation direction
- Upgrade EasyFTP Server to 1.7.0.12 or later where available.
- If upgrade is unavailable, remove or replace the legacy FTP service.
- Restrict FTP access to trusted networks only.
- Disable anonymous access if still enabled.
- Monitor vendor or maintainer guidance for UplusFtp/EasyFTP advisories.
Validation and detection
- Inventory hosts for EasyFTP Server and UplusFtp installations.
- Confirm installed versions are later than 1.7.0.11.
- Check whether FTP is reachable from the internet or untrusted networks.
- Review configuration for anonymous FTP access.
- Prioritize any externally reachable legacy FTP server for remediation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-121: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2010-20121 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://seclists.org/bugtraq/2010/Feb/202CVE reference, VulnCheck · third-party-advisory, exploit
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/ftp/easyftp_cwd_fixret.rbCVE reference, VulnCheck · exploit
- https://paulmakowski.wordpress.com/2010/02/28/increasing-payload-size-w-return-address-overwrite/CVE reference, VulnCheck · technical-description, exploit
- https://www.exploit-db.com/exploits/12312CVE reference, VulnCheck · exploit
- https://www.exploit-db.com/exploits/16737CVE reference, VulnCheck · exploit
- https://www.exploit-db.com/exploits/11668CVE reference, VulnCheck · exploit
- https://www.exploit-db.com/exploits/14402CVE reference, VulnCheck · exploit
- https://www.vulncheck.com/advisories/easyftp-server-cwd-command-stack-buffer-overflowCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.