// For flags

CVE-2021-33582

cyrus-imapd: Denial of service via string hashing algorithm collisions

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Cyrus IMAP before 3.4.2 allows remote attackers to cause a denial of service (multiple-minute daemon hang) via input that is mishandled during hash-table interaction. Because there are many insertions into a single bucket, strcmp becomes slow. This is fixed in 3.4.2, 3.2.8, and 3.0.16.

Cyrus IMAP versiones anteriores a 3.4.2, permite a atacantes remotos causar una denegación de servicio (cuelgue del demonio de varios minutos) por medio de una entrada manejada inapropiadamente durante la interacción de la tabla hash. Debido a que presenta muchas inserciones en un solo cubo, strcmp se vuelve lento. Esto se ha corregido en las versiones 3.4.2, 3.2.8 y 3.0.16

A flaw was found in cyrus-imapd. A bad string hashing algorithm used in internal hash tables allows user inputs to be stored in predictable buckets. A user may cause a CPU denial of service by maliciously directing many inputs to a single bucket. The highest threat from this vulnerability is to system availability.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-05-26 CVE Reserved
  • 2021-09-01 CVE Published
  • 2024-08-03 CVE Updated
  • 2024-10-04 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-400: Uncontrolled Resource Consumption
  • CWE-407: Inefficient Algorithmic Complexity
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cyrus
Search vendor "Cyrus"
 Imap
Search vendor "Cyrus" for product "Imap"
 < 3.0.16
Search vendor "Cyrus" for product "Imap" and version " < 3.0.16"
-
Affected
Cyrus
Search vendor "Cyrus"
 Imap
Search vendor "Cyrus" for product "Imap"
 >= 3.2.0 < 3.2.8
Search vendor "Cyrus" for product "Imap" and version " >= 3.2.0 < 3.2.8"
-
Affected
Cyrus
Search vendor "Cyrus"
 Imap
Search vendor "Cyrus" for product "Imap"
 >= 3.4.0 < 3.4.2
Search vendor "Cyrus" for product "Imap" and version " >= 3.4.0 < 3.4.2"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 34
Search vendor "Fedoraproject" for product "Fedora" and version "34"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 35
Search vendor "Fedoraproject" for product "Fedora" and version "35"
-
Affected
Debian
Search vendor "Debian"
 Debian Linux
Search vendor "Debian" for product "Debian Linux"
 9.0
Search vendor "Debian" for product "Debian Linux" and version "9.0"
-
Affected