HOMEVULNERABILITIESCVE-2019-3823
MEDIUM

CVE-2019-3823

CWE-125Published: February 6, 2019· Updated: Jun 17, 2026

4.3
CVSS v3.1

Official Description

libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.

NVD Source

Technical Analysis

CVE-2019-3823 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected Vendors & Products

Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
haxx1 product(s)
libcurl
netapp1 product(s)
clustered data ontap
Oracle3 product(s)
communications operations monitorhttp serversecure global desktop
Source: NVD CPE · 11 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
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3823
PATCHhttps://curl.haxx.se/docs/CVE-2019-3823.html
PATCHhttps://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3823
PATCHhttps://curl.haxx.se/docs/CVE-2019-3823.html
PATCHhttps://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
ADVISORYhttp://www.securityfocus.com/bid/106950
ADVISORYhttps://security.gentoo.org/glsa/201903-03
ADVISORYhttps://security.netapp.com/advisory/ntap-20190315-0001/
ADVISORYhttps://usn.ubuntu.com/3882-1/
ADVISORYhttps://www.debian.org/security/2019/dsa-4386
ADVISORYhttp://www.securityfocus.com/bid/106950
ADVISORYhttps://security.gentoo.org/glsa/201903-03
ADVISORYhttps://security.netapp.com/advisory/ntap-20190315-0001/
ADVISORYhttps://usn.ubuntu.com/3882-1/
ADVISORYhttps://www.debian.org/security/2019/dsa-4386

All References (24)

→
http://www.securityfocus.com/bid/106950Third Party Advisory · VDB Entry
→
https://access.redhat.com/errata/RHSA-2019:3701
→
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3823Exploit · Issue Tracking · Patch · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-936080.pdf
→
https://curl.haxx.se/docs/CVE-2019-3823.htmlPatch · Vendor Advisory
→
https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E
→
https://security.gentoo.org/glsa/201903-03Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20190315-0001/Exploit · Third Party Advisory
→
https://usn.ubuntu.com/3882-1/Third Party Advisory
→
https://www.debian.org/security/2019/dsa-4386Third Party Advisory
→
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.htmlPatch · Third Party Advisory
→
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
→
http://www.securityfocus.com/bid/106950Third Party Advisory · VDB Entry
→
https://access.redhat.com/errata/RHSA-2019:3701
→
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3823Exploit · Issue Tracking · Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2019-3823
CVSS Score4.3 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
Affected5 vendor(s)
PublishedFeb 6, 2019

Related CVEs (CWE-125)

CVE-2021-41556
10.0
CVE-2013-0767
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CVE-2009-2523
10.0
CVE-2021-21777
10.0
CVE-2017-14451
10.0
CVE-2026-34987
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-3823 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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