CVE-2019-3823

Libcurl vulnerability

CVSS

4.3

EPSS

4.3%

EPSS pct

90th

Exploited

No known

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.

Affected vendor

Haxx

Affected product

Libcurl

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Weakness type (CWE)

CWE-125 — Out-of-bounds Read

Published

2019-02-06

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to low impact to confidentiality.

Its EPSS score of 4.3% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2019-3823

Confirm whether Haxx Libcurl is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-3823.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-3823

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-3823 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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