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CVE-2020-13775

ZNC 1.8.0 up to 1.8.1-rc1 allows attackers to trigger an application crash (with a NULL pointer...

6.5 MediumFix available

ZNC 1.8.0 up to 1.8.1-rc1 allows authenticated users to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.85%Up 0.8 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

ZNC 1.8.0 up to 1.8.1-rc1 allows authenticated users to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Record
CVE-2020-13775
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
3.5 LowAV:N/AC:M/Au:S/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

ZNC 1.8.0 up to 1.8.1-rc1 allows authenticated users to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Record
CVE-2020-13775
Updated
2026-11-02
EUVDEUVD-2020-5992 No score

ZNC 1.8.0 up to 1.8.1-rc1 allows authenticated users to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Record
EUVD-2020-5992
Updated
2026-11-03
GitHub AdvisoriesGHSA-853m-wxj4-w3h5 6.5

ZNC 1.8.0 up to 1.8.1-rc1 allows attackers to trigger an application crash (with a NULL pointer...

ZNC 1.8.0 up to 1.8.1-rc1 allows attackers to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Record
GHSA-853m-wxj4-w3h5
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
OSVALPINE-CVE-2020-13775 6.5

ZNC 1.8.0 up to 1.8.1-rc1 allows authenticated users to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Record
ALPINE-CVE-2020-13775
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-03
OSV 6.5

ZNC 1.8.0 up to 1.8.1-rc1 allows authenticated users to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Record
CVE-2020-13775
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2020-13775 6.5

ZNC 1.8.0 up to 1.8.1-rc1 allows authenticated users to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Record
DEBIAN-CVE-2020-13775
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-13775 6.5

ZNC 1.8.0 up to 1.8.1-rc1 allows authenticated users to trigger an application crash (with a NULL pointer dereference) if echo-message is not enabled and there is no network.

Record
UBUNTU-CVE-2020-13775
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2020-0316 No score

Updated znc packages fix security vulnerability

The znc package has been updated to version 1.8.1, containing several bugfixes and enhancements. See the upstream change logs for details.

Record
MGASA-2020-0316
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
znc
Alpine:v3.12
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.13
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.14
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.15
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.16
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.17
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.18
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.19
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.20
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.21
 before 1.8.1-r0
1.8.1-r0
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Affected packages
PackageAffectedFixed
znc
Alpine:v3.22
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.23
 before 1.8.1-r0
1.8.1-r0
znc
Alpine:v3.24
 before 1.8.1-r0
1.8.1-r0
znc
Debian:12
 before 1.8.1-1
1.8.1-1
znc
Debian:13
 before 1.8.1-1
1.8.1-1
znc
Debian:14
 before 1.8.1-1
1.8.1-1
znc
Mageia:7
 before 1.8.1-1.mga7
1.8.1-1.mga7
znc
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1.0-51.0-5build11.2-11.2-21.2-3
Show 4 moreShow less
1.2-3build11.2-3ubuntu0.11.2-3ubuntu0.1+esm11.2-3ubuntu0.1+esm3
 None known
znc
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.6.1-11.6.1-1build11.6.1-21.6.2-11.6.2-2
Show 5 moreShow less
1.6.2-2build11.6.3-11.6.3-1ubuntu0.11.6.3-1ubuntu0.21.6.3-1ubuntu0.2+esm2
 None known
znc
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.6.5-2build21.6.5-2build31.6.5-2build41.6.5-2build51.6.6-11.6.6-1ubuntu0.11.6.6-1ubuntu0.21.6.6-1ubuntu0.2+esm2
 None known
znc
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1.7.4-71.7.4-7build11.7.5-11.7.5-21.7.5-2build1
Show 6 moreShow less
1.7.5-2build21.7.5-2build31.7.5-31.7.5-3build11.7.5-41.7.5-4ubuntu0.1~esm2
 None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-13775 is a medium vulnerability (CVSS 6.5) in Znc, published June 2, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.85%, the 79th percentile. Fixed in znc 1.8.1-r0.

References

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