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    CVE-2020-28200

    The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.

    Published:Jun 21, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 28, 2021
    EPSS Score:0.00959
    CVSS Score:4.3

    Affected Products

    Vendor
    Dovecot
    Product
    Dovecot
    Vendor
    Fedoraproject
    Product
    Fedora

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-40016 (CVSS 5.3) — Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU ti…
    CVE-2026-33603 (CVSS 6.8) — Attacker can use a specially crafted base64 exchange between Dovecot and Client to fake SCRAM TLS channel bind…
    CVE-2026-27851 (CVSS 7.4) — When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly i…
    CVE-2026-27860 (CVSS 3.7) — If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authenticati…
    CVE-2026-27859 (CVSS 5.3) — A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU. A suit…
    CVE-2026-27858 (CVSS 7.5) — Attacker can send a specifically crafted message before authentication that causes managesieve to allocate lar…
    CVE-2026-27857 (CVSS 4.3) — Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer c…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High