CVE-2018-6535
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password...
CVE-2018-6535 is a high vulnerability (CVSS 8.1) in Icinga, published February 27, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.33%, the 71st percentile. Fixed in icinga2 2.8.4-1.
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.
- Record
CVE-2018-6535- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:P/I:N/A:N - Updated
- 2026-11-02
CVE List No score
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.
- Record
CVE-2018-6535- Updated
- 2026-11-02
EUVDEUVD-2018-18287 No score
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.
- Record
EUVD-2018-18287- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-5535-phc2-4862
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password...
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.
- Record
GHSA-5535-phc2-4862- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSV
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.
- Record
CVE-2018-6535- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2018-6535
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.
- Record
DEBIAN-CVE-2018-6535- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-6535
An issue was discovered in Icinga 2.x through 2.8.1. The lack of a constant-time password comparison function can disclose the password to an attacker.
- Record
UBUNTU-CVE-2018-6535- CVSS 3.0
- 8.1 High
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
icinga2Debian:12 |
before 2.8.4-1 | 2.8.4-1 |
icinga2Debian:13 |
before 2.8.4-1 | 2.8.4-1 |
icinga2Debian:14 |
before 2.8.4-1 | 2.8.4-1 |
icingaUbuntu:16.04:LTS |
All versions, plus listed versions 1.13.3-11.13.3-21.13.3-2ubuntu0.1 |
None known |
icingaUbuntu:18.04:LTS |
All versions, plus listed versions 1.13.4-2build1 |
None known |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |