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Vulnerabilities/CVE-2021-44026
Vulnerability dossier

CVE-2021-44026

Roundcube SQL Injection via Search Parameters

VendordebianPublishedNov 18, 2021SourceNVDWeaknessCWE-89
Act now

Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.

Severity
Critical · 9.8
CVSS base score
Exploitation
In the wild
CISA KEV
Predicted risk
70% model
EPSS forecast — overtaken by confirmed exploitation
Exposure
Internet-facing
Exploitable remotely, no login, no user action
01

What's the risk?

An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.

Roundcube before 1.3.17 and 1.4.x before 1.4.12 is prone to a potential SQL injection via search or search_params.

How it's exploitedMITRE ATT&CK · inferred from weakness & vector
Initial Access
T1190Exploit Public-Facing Application

Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.

02

Who's exploiting it?

Corroborated threat activity referencing this CVE — with source and confidence, not inference.

Confirmed exploited in the wild. CISA KEV · catalogued Jun 22, 2023

Named threat actors and observed ATT&CK techniques appear here as intel feeds are folded in — the ATT&CK chain above stays inferred until then.

03

Are we affected?

7
  • Affecteddebian · debian_linux10.0
  • Affecteddebian · debian_linux9.0
  • Affecteddebian · debian_linux11.0
  • Affectedfedoraproject · fedora
34
  • Affectedfedoraproject · fedora33
  • Affectedroundcube · webmailall versions
  • Affectedroundcube · webmailall versions
  • 04

    What to do

    Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.

    1. !

      Mitigate now

      Implement a Web Application Firewall (WAF) to filter and block suspicious SQL injection attempts against Roundcube's web interface. Enhance server-side logging for Roundcube and monitor for unusual database query patterns or error messages indicative of injection attempts. Restrict network access to the Roundcube instance to only necessary internal users or trusted IP ranges.

    2. ✓

      Permanent fix

      The permanent resolution is to upgrade Roundcube to version 1.3.17 or later, or version 1.4.12 or later for the 1.4.x branch. Apply the official patches released by the Roundcube project immediately to address this critical SQL injection vulnerability.

    Technical details— weakness, CVSS vector & calculator, related CVEs

    Business impact

    An attacker can inject malicious SQL queries via the search or search_params fields. This could lead to unauthorized access to sensitive user data, database manipulation, or potentially full compromise of the underlying database server, affecting data integrity and confidentiality.

    Weakness

    1
    CWE-89Common Weakness Enumeration · MITRE definition

    CVSS 3.1 details

    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    0.0
    / 10.0 base
    Critical severity
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Exploitability metrics
    Attack VectorAV
    Remotely exploitable across a network
    Attack ComplexityAC
    No special conditions required
    Privileges RequiredPR
    No authorization needed
    User InteractionUI
    No user participation needed
    Impact metrics
    ScopeS
    Impact confined to the vulnerable component
    ConfidentialityC
    Total loss of confidentiality
    IntegrityI
    Total loss of integrity
    AvailabilityA
    Total loss of availability

    Related vulnerabilities

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    0.0
    / 10.0 base
    Critical severity
    Key facts
    CVE ID
    CVE-2021-44026
    Published
    Nov 18, 2021
    Last modified
    Nov 4, 2025
    CVSS
    9.8 (v3.1)
    EPSS
    69.88%
    In CISA KEV
    Yes
    Confidence
    100/100
    Weakness
    CWE-89
    Timeline
    1. Nov 18, 2021Published to NVDNVD
    2. Nov 4, 2025Record last modifiedNVD
    3. Aug 16, 2026AI analysis generatedWavense
    View on NVD