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No exploitation reportedFix available

CVE-2019-3822

No exploitation reported by the sources we read.

  • Published2019-02-06
  • WeaknessCWE-121 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.

Timeline

dates in UTC
  1. 2019-02-0620:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-3822?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-3822?format=csv
  • TAXII collection of exploited CVEs
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Versions per branch

NVD
Canonical ubuntu linux
BranchAffectedFixed in
14.4= 14.04no fix published
16.4= 16.04no fix published
18.4= 18.04no fix published
18.10= 18.10no fix published
Netapp active iq unified manager
BranchAffectedFixed in
7.3+≥ 7.3no fix published
9.5+≥ 9.5no fix published
Oracle communications operations monitor
BranchAffectedFixed in
3.4= 3.4no fix published
4.0= 4.0no fix published

13 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As redhat, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • The curl Project curl
    Affected
    • = 7.64.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2019-11-06

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • curlUbuntu:18.04:LTSall versions · fixed in 7.58.0-2ubuntu3.6
  • curlUbuntu:16.04:LTSall versions · fixed in 7.47.0-1ubuntu2.12
  • curlUbuntu:14.04:LTSall versions · fixed in 7.35.0-1ubuntu2.20
  • curlSUSE:OpenStack Cloud 7all versions · fixed in 7.37.0-37.34.1
  • curlSUSE:Linux Enterprise Software Development Kit 12 SP4all versions · fixed in 7.60.0-4.3.1
  • curlSUSE:Linux Enterprise Software Development Kit 12 SP3all versions · fixed in 7.37.0-37.34.1
  • curlSUSE:Linux Enterprise Server for SAP Applications 12 SP4all versions · fixed in 7.60.0-4.3.1
  • curlSUSE:Linux Enterprise Server for SAP Applications 12 SP3all versions · fixed in 7.37.0-37.34.1

40 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-3822 Red Hat Product Security46 products fixed · 14 known affected

    curl: NTLMv2 type-3 header stack buffer overflow

    rh-dotnetcore10-curl.src as a component of .NET Core 1.0 on Red Hat Enterprise Linux · rh-dotnetcore11-curl.src as a component of .NET Core 1.1 on Red Hat Enterprise Linux · rh-dotnet21-curl.src as a component of .NET Core 2.1 on Red Hat Enterprise Linux · +11 more

  • RHSA-2019:3701 Red Hat Product Security45 products fixed

    Red Hat Security Advisory: curl security and bug fix update

  • RHSA-2019:1543 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.29 SP2 security update

  • ICSA-19-099-04 CISA2 known affected

    Siemens SINEMA Remote Connect (Update A)

    SINEMA Remote Connect Client: All versions < V2.0 HF1 · SINEMA Remote Connect Server: All versions < V2.0

  • ICSA-21-068-10 CISA1 known affected

    Siemens SCALANCE and SIMATIC libcurl (Update B)

    Siemens SINEMA Remote Connect Client: All versions < V2.0 HF1

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2019:3701 · 45 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  2. Vendor fix Red Hat Product Security RHSA-2019:1543 · 1 productThe References section of this erratum contains a download link (you must log in to download the update). Before applying the update, back up your existing Red Hat JBoss Core Services installation (including all applications and configuration files).
  3. Vendor fix CISA ICSA-19-099-04 · 2 productsTurn off NTLM authentication to mitigate CVE-2018-16890 and CVE-2019-3822
  4. Vendor fix CISA ICSA-19-099-04 · 2 productsTurn off SMTP to mitigate CVE-2019-3823
  5. Vendor fix CISA ICSA-19-099-04 · 1 productUpdate to V2.0 HF1 - Download: https://support.industry.siemens.com/cs/de/en/view/109764829/
  6. Vendor fix CISA ICSA-21-068-10 · 1 productUpdate to V2.0 HF1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-04-15
  • OpenCVESSVC decisionnone—
  • NVDCVSS 3.19.8read 2026-10-23
  • CNACVSS 3.07.1known since 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-121known since 2026-10-23
  • NVDweakness (CWE)CWE-787read 2026-10-23
  • FIRST EPSSEPSS score12.9 %read 2026-11-02
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2019-02-06
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-8wr2-mqj7-7vxp

Frequently asked questions

What is CVE-2019-3822?

libcurl versions from 7.36.0 to before 7.64.0 are vulnerable to a stack-based buffer overflow. The function creating an outgoing NTLM type-3 header (`lib/vauth/ntlm.c:Curl_auth_create_ntlm_type3_message()`), generates the request HTTP header contents based on previously received data. The check that exists to prevent the local buffer from getting overflowed is implemented wrongly (using unsigned math) and as such it does not prevent the overflow from happening. This output data can grow larger than the local buffer if very large 'nt response' data is extracted from a previous NTLMv2 header provided by the malicious or broken HTTP server. Such a 'large value' needs to be around 1000 bytes or more. The actual payload data copied to the target buffer comes from the NTLMv2 type-2 response header.

Is CVE-2019-3822 actively exploited?

Active exploitation of CVE-2019-3822 has not been confirmed. Its EPSS score was 12.9% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-3822?

CVE-2019-3822 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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