CVE-2019-20871
HIGHCVSS 7.5/10EPSS 1.11%
Last modified
CVE-2019-20871 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The Markdown library allows catastrophic backtracking.. EPSS estimates a 1.11% chance of exploitation in the next 30 days.
Description
An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The Markdown library allows catastrophic backtracking.
Metrics
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Mattermost | Mattermost Server | < 4.10.8 | — |
| Mattermost | Mattermost Server | >= 5.7.0, < 5.7.3 | — |
| Mattermost | Mattermost Server | >= 5.8.0, < 5.8.1 | — |
| Mattermost | Mattermost Server | 5.9.0 | Rc1 |
References
- https://mattermost.com/security-updates/Vendor Advisory
- https://mattermost.com/security-updates/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-20871?
An issue was discovered in Mattermost Server before 5.9.0, 5.8.1, 5.7.3, and 4.10.8. The Markdown library allows catastrophic backtracking.
How severe is CVE-2019-20871?
CVE-2019-20871 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.11% probability of exploitation in the next 30 days.
How do I fix CVE-2019-20871?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2019
- CVE-2019-20866An issue was discovered in Mattermost Server before 5.12.0. …5.3
- CVE-2019-20867An issue was discovered in Mattermost Server before 5.11.0. …5.3
- CVE-2019-20868An issue was discovered in Mattermost Server before 5.11.0. …7.5
- CVE-2019-20869An issue was discovered in Mattermost Server before 5.10.0, …5.3
- CVE-2019-2087In libxaac, there is a possible out of bounds write due to a…8.8
- CVE-2019-20870An issue was discovered in Mattermost Server before 5.10.0. …4.3
- CVE-2019-20872An issue was discovered in Mattermost Server before 5.9.0, 5…5.5
- CVE-2019-20873An issue was discovered in Mattermost Server before 5.9.0, 5…6.5
- CVE-2019-20874An issue was discovered in Mattermost Server before 5.9.0, 5…7.5
- CVE-2019-20875An issue was discovered in Mattermost Server before 5.9.0, 5…5.3
- CVE-2019-20876An issue was discovered in Mattermost Server before 5.9.0, 5…5.4
- CVE-2019-20877An issue was discovered in Mattermost Server before 5.9.0, 5…5.3
Are you affected by CVE-2019-20871?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST