Debian LinuxOperating system · Debian
CVE-2020-15954
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 · uneditedKDE KMail 19.12.3 (aka 5.13.3) engages in unencrypted POP3 communication during times when the UI indicates that encryption is in use.
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 confidenceKDE KMail 19.12.3 incorrectly displays that encryption is active for POP3 connections while actually transmitting data unencrypted. This creates a false sense of security where users believe their email credentials and content are protected, when in fact the communication is vulnerable to interception.
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
Debian LinuxOperating system
= 9.0= 19.12.3CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
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 KMail versionRun 'kmail --version' or check your package manager (dpkg -l | grep kmail on Debian). Confirm the exact version number.Affected if Version is 19.12.3 (the affected version)
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Locate KMail configuration directoryNavigate to ~/.config/ or the location where KMail stores accounts (typically akonadi resources). Look for POP3 account configuration files.Affected if POP3 accounts are configured in KMail 19.12.3
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Examine POP3 account encryption settingsOpen KMail settings, go to Account Settings > Receiving tab, select the POP3 account, and check the 'Encryption' dropdown. Look for whether it is set to 'None', 'TLS', or 'SSL/TLS', and whether 'Use SSL/TLS' or 'StartTLS' is actually enabled.Affected if Encryption is set to anything other than 'Required' or the connection fails to actually negotiate encryption while showing it as active
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Verify actual network connection encryptionCapture network traffic during a POP3 sync using tcpdump or Wireshark (e.g., tcpdump -i <interface> -w capture.pcap port 110 or 995). Inspect whether the traffic is plaintext or encrypted.Affected if Network capture shows plaintext POP3 traffic (port 110) despite KMail UI indicating encryption is enabled
A user is affected if running KMail 19.12.3 with a POP3 account where the UI shows encryption is active but the actual network traffic is transmitted unencrypted.
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.
From vendor dataUsers should verify actual encryption through server logs or network packet inspection, and avoid using POP3 on untrusted networks until the patch is applied. Administrators may also enforce TLS on the mail server side.
Fix this in Debian Linux
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 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 $2,560.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-15954 — 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-2020-15954 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data