Security readout for executives and security teams
Plain-English summary
IPCop is a legacy open-source firewall appliance. A flaw in its web admin lets a logged-in administrator slip operating system commands into the email password field and trigger them by sending a test email. The result is full takeover of the firewall protecting the network. Because IPCop is end-of-life and unsupported, any system still running it carries permanent risk.
Executive priority
Treat as high priority only if IPCop is still in your environment; otherwise informational. There is no vendor patch and the product is unsupported, so the durable fix is replacement, not remediation. Plan a migration window and tighten admin access immediately.
Technical view
The IPCop 2.1.9 and earlier web GUI passes the EMAIL_PW value into a system-level call without sanitizing shell metacharacters (CWE-78, OS command injection). An authenticated user with access to the email configuration page can save a crafted password and invoke the save-and-test-mail action to execute arbitrary commands as the web interface user. CVSS 4.0 is 8.7; the vector reflects network reach, low complexity, and low-privilege authentication with full confidentiality, integrity, and availability impact.
Likely exposure
Limited to organizations still operating IPCop firewalls, an end-of-life Linux distribution last updated in 2015. Exposure rises sharply where the admin interface is reachable beyond a trusted management segment or where admin credentials are weak, shared, or reused.
Exploitation context
Public proof-of-concept exists on Exploit-DB (entry 50183) and a third-party advisory is published by VulnCheck. CISA KEV does not list this CVE and the source bundle does not cite confirmed in-the-wild exploitation. Exploitation requires valid administrator authentication to the IPCop web GUI.
Researcher notes
Authentication boundary is the key control: this is a post-auth OS command injection in the email configuration handler via EMAIL_PW. CVSS 4.0 vector indicates PR:L and full VC/VI/VA impact with no scope change. With public PoC at Exploit-DB 50183 and a VulnCheck advisory, expect opportunistic abuse against any reachable, credential-weak IPCop hosts. Monitor for vendor or community guidance, but assume no upstream patch is forthcoming given the project's end-of-life status.
Mitigation direction
- Inventory and identify any IPCop firewall instances still in production or lab use.
- Migrate off IPCop to a supported firewall platform; the project is no longer maintained.
- Until migration completes, restrict the web admin interface to an isolated management network.
- Rotate IPCop administrator credentials and enforce strong, unique passwords.
- Monitor IPCop hosts for unexpected outbound connections or new processes spawned by the web user.
- Consult IPCop project pages and the VulnCheck advisory for any community guidance before changes.
Validation and detection
- Query asset inventory and network scans for IPCop banners or characteristic admin ports.
- Confirm installed IPCop version against 2.1.9 and earlier from console or package metadata.
- Verify whether the admin web interface is reachable from untrusted networks or VPN segments.
- Review web server and shell history logs for anomalous email configuration changes or test-mail actions.
- Test administrative authentication policy to ensure no shared or default accounts remain enabled.
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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-4466 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
- High
- CVSS
- 8.7 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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.
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:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.exploit-db.com/exploits/50183CVE reference · exploit
- https://www.ipcop.org/CVE reference · product
- https://sourceforge.net/projects/ipcop/CVE reference · product
- https://www.vulncheck.com/advisories/ipcop-authenticated-rceCVE reference · 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.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.