CVE-2020-8156
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
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
- Low
- Availability
- Low
Exploit likelihood
What each source reports
NVD Score used
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
- Record
CVE-2020-8156- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-295
- Updated
- 2026-11-02
CVE List No score
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
- Record
CVE-2020-8156- Weakness
- CWE-295
- Updated
- 2026-11-02
EUVDEUVD-2020-29049 No score
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
- Record
EUVD-2020-29049- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-fgvj-4m6x-j67f
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
- Record
GHSA-fgvj-4m6x-j67f- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L - Weakness
- CWE-295
- Updated
- 2026-11-02
OSV
A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
- Record
CVE-2020-8156- CVSS 3.1
- 7.0 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-8156 is a high vulnerability (CVSS 7.0) in Nextcloud Mail, published May 12, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.96%, the 61st percentile. No source names a fixed version.
References
nextcloud.com/security/advisory?id=NC-SA-2020-020
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KC6HLX5SG4PZO6Y54D2LFJ4ATG76BKOP
nvd.nist.gov/vuln/detail/CVE-2020-8156
github.com/advisories/GHSA-fgvj-4m6x-j67f