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FedoraOperating system · Fedoraproject

CVE-2020-8518

CRITICAL · 9.8 CVSS v3.1 Published 2020-02-17
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
100/100
Remediation priority · Urgent
High EPSS Public exploit Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Horde Groupware Webmail Edition 5.2.22 allows injection of arbitrary PHP code via CSV data, leading to remote code execution.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-94

The application evaluates attacker-influenced input as code, handing them a way to run logic inside the process. Depending on the runtime this can escalate directly to remote code execution. Remediation means removing dynamic evaluation of untrusted input and replacing it with safe, data-driven alternatives.

General guidance for the code injection class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FedoraOperating system
Affected:= 30= 31
Debian LinuxOperating system
Affected:= 8.0
GroupwareApplication
Affected:= 5.2.22

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Recommended fix Moderate confidence

Horde Groupware Webmail Edition 5.2.23 or later (latest stable 5.x series)

  1. 1. Identify the exact Horde Groupware Webmail Edition installation (check /usr/share/horde or equivalent path for version)
  2. 2. For Fedora 30/31 systems: Run 'dnf check-update' and then 'dnf update horde' to apply available security updates
  3. 3. For Debian 8.0 systems: Run 'apt-get update' and then 'apt-get upgrade horde' to apply available security updates
  4. 4. Alternatively, download the latest Horde Groupware Webmail Edition from the official Horde project (lists.horde.org)
  5. 5. Backup the current Horde installation and database before upgrading
  6. 6. Install the upgraded package or extract new files to the Horde directory
  7. 7. Clear any PHP opcode caches (e.g., APC, OPcache)
  8. 8. Restart the web server (httpd/apache/nginx)
Caveat Review Horde changelog for database schema changes; some upgrades may require running migration scripts

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists Fedora has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-8518 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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