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01 Record

CVE-2019-3823

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

MediumPUBLISHEDCNA: redhat
CNA base score4.3 CVSS v3.xCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

02 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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
4.11% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 90.5% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2019-02-06 20:00Z7 YR AGO
Last updated
2026-04-15 20:52Z6 MO AGO
Reserved
2019-01-03
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Medium (CVSS 4.3)
CNA CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Weaknesses
Data version
5.2
Document digest
0101fbe8ba935af2059a782c12afdfe3fa699ea58ab4d0427265cd75018e48a1

05 Affected products

VendorProductVersionsPlatforms
The curl Projectcurl7.64.0—

06 References

07 Fixed in

Arch Linux

  • curl
    Fixed in 7.64.0-1
  • lib32-curl
    Fixed in 7.64.0-1
  • lib32-libcurl-compat
    Fixed in 7.64.0-1
  • lib32-libcurl-gnutls
    Fixed in 7.64.0-1
  • libcurl-gnutls
    Fixed in 7.64.0-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

Debian 12

  • curl
    Fixed in 7.64.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • curl
    Fixed in 7.64.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • curl
    Fixed in 7.64.0-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 14.04 LTS

  • curl
    Fixed in 7.35.0-1ubuntu2.20

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • curl
    Fixed in 7.47.0-1ubuntu2.12

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • curl
    Fixed in 7.58.0-2ubuntu3.6

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.