CVE-2019-3823 (GCVE-0-2019-3823)
Vulnerability from cvelistv5 – Published: 2019-02-06 20:00 – Updated: 2026-04-15 20:52
VLAI
EPSS
VEX
Summary
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.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-15 20:52 UTC
CWE
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://security.gentoo.org/glsa/201903-03 | vendor-advisoryx_refsource_GENTOO |
| https://www.debian.org/security/2019/dsa-4386 | vendor-advisoryx_refsource_DEBIAN |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2… | x_refsource_CONFIRM |
| https://curl.haxx.se/docs/CVE-2019-3823.html | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2019031… | x_refsource_CONFIRM |
| https://usn.ubuntu.com/3882-1/ | vendor-advisoryx_refsource_UBUNTU |
| http://www.securityfocus.com/bid/106950 | vdb-entryx_refsource_BID |
| https://lists.apache.org/thread.html/8338a0f605bd… | mailing-listx_refsource_MLIST |
| https://www.oracle.com/technetwork/security-advis… | x_refsource_MISC |
| https://www.oracle.com/technetwork/security-advis… | x_refsource_MISC |
| https://access.redhat.com/errata/RHSA-2019:3701 | vendor-advisoryx_refsource_REDHAT |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| The curl Project | curl |
Affected:
7.64.0
|
guessed |
Date Public
2019-02-06 00:00
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\"https://access.redhat.com/errata/RHSA-2019:3701\", \"name\": \"RHSA-2019:3701\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-936080.pdf\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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. 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"cveMetadata": "{\"cveId\": \"CVE-2019-3823\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-15T20:52:15.885Z\", \"dateReserved\": \"2019-01-03T00:00:00.000Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2019-02-06T20:00:00.000Z\", \"assignerShortName\": \"redhat\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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