CVE-2020-12637
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedZulip Desktop before 5.2.0 has Missing SSL Certificate Validation because all validation was inadvertently disabled during an attempt to recognize the ignoreCerts option.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceZulip Desktop before version 5.2.0 has a critical SSL certificate validation bypass vulnerability. During implementation of an 'ignoreCerts' option intended for development environments, all SSL certificate validation was inadvertently disabled rather than just for the specific intended cases. This allows remote attackers to perform man-in-the-middle attacks by presenting fraudulent or compromised SSL certificates, intercepting encrypted communications.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 0.5.10, < 5.2.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed Zulip Desktop versionOpen the Zulip Desktop application and navigate to Help > About, or check your system's installed applications list for the Zulip Desktop versionAffected if The displayed version is 0.5.10 or higher but lower than 5.2.0
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Confirm version is within affected rangeCompare your installed version against the known affected range: version >= 0.5.10 and version < 5.2.0Affected if Your version is 0.5.10, 0.5.11, 0.6.0, or any version up to and including 5.1.x
If Zulip Desktop is installed and the version number falls between 0.5.10 and 5.1.x inclusive, your environment is affected by this SSL certificate validation bypass vulnerability.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped5.2.0
Upgrade to Zulip Desktop 5.2.0 or later which contains the proper fix for certificate validation logic. Until upgraded, avoid using the application on untrusted networks where MITM attacks are possible.
Zulip Desktop 5.2.0 or later
- 1. Back up any important data or custom configurations from your current Zulip Desktop installation.
- 2. Uninstall the current version of Zulip Desktop.
- 3. Download Zulip Desktop version 5.2.0 or later from the official Zulip website (zulip.com) or the appropriate package manager.
- 4. Install the new version of Zulip Desktop.
- 5. Verify the installation by checking the application version in the Help/About section.
- 6. Reconfigure any custom settings if needed and verify SSL certificate validation is working properly.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-12637 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-12637 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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