HOMEVULNERABILITIESCVE-2019-11340
MEDIUM

CVE-2019-11340

CWE-20Published: April 19, 2019· Updated: Jun 17, 2026

5.9
CVSS v3.1

Official Description

util/emailutils.py in Matrix Sydent before 1.0.2 mishandles registration restrictions that are based on e-mail domain, if the allowed_local_3pids option is enabled. This occurs because of potentially unwanted behavior in Python, in which an email.utils.parseaddr call on user@bad.example.net@good.example.com returns the user@bad.example.net substring.

NVD Source

Technical Analysis

CVE-2019-11340 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.9.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

matrix1 product(s)
sydent
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fc
PATCHhttps://github.com/matrix-org/sydent/compare/7c002cd...09278fb
PATCHhttps://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fc
PATCHhttps://github.com/matrix-org/sydent/compare/7c002cd...09278fb
ADVISORYhttps://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/
ADVISORYhttps://twitter.com/matrixdotorg/status/1118934335963500545
ADVISORYhttps://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/
ADVISORYhttps://twitter.com/matrixdotorg/status/1118934335963500545

All References (8)

→
https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fcPatch · Third Party Advisory
→
https://github.com/matrix-org/sydent/compare/7c002cd...09278fbPatch · Third Party Advisory
→
https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/Release Notes · Vendor Advisory
→
https://twitter.com/matrixdotorg/status/1118934335963500545Third Party Advisory
→
https://github.com/matrix-org/sydent/commit/4e1cfff53429c49c87d5c457a18ed435520044fcPatch · Third Party Advisory
→
https://github.com/matrix-org/sydent/compare/7c002cd...09278fbPatch · Third Party Advisory
→
https://matrix.org/blog/2019/04/18/security-update-sydent-1-0-2/Release Notes · Vendor Advisory
→
https://twitter.com/matrixdotorg/status/1118934335963500545Third Party Advisory

Quick Facts

CVE IDCVE-2019-11340
CVSS Score5.9 / 10
SeverityMEDIUM
WeaknessCWE-20
CISA KEVNo
Affected1 vendor(s)
PublishedApr 19, 2019

Related CVEs (CWE-20)

CVE-2008-6826
10.0
CVE-2003-1425
10.0
CVE-2023-41917
10.0
CVE-2007-6494
10.0
CVE-2008-1331
10.0
CVE-2007-6176
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-11340 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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