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CVE Record

CVE-2017-8816: The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to c...

The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer overflow and resultant buffer overflow, and application crash) or possibly have unspecified other impact via vectors involving long user and password fields.

CriticalCVSS 9.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

This vulnerability affects old 32-bit curl/libcurl builds using NTLM authentication. Very long username or password values can trigger an integer overflow that may crash the application and could have other unspecified impact. The sources do not show confirmed active exploitation.

Executive priority

Prioritize remediation for internet-facing, authentication-brokering, proxy, integration, or embedded systems that use 32-bit curl/libcurl with NTLM. Legacy systems are the main concern.

Technical view

CVE-2017-8816 is a CWE-190 integer overflow in NTLM authentication in curl and libcurl before 7.57.0 on 32-bit platforms. Long user and password fields can lead to a resultant buffer overflow, application crash, or unspecified other impact.

Likely exposure

Exposure is most likely in legacy 32-bit systems or embedded products running curl/libcurl before 7.57.0 where NTLM authentication is used directly or through dependent software.

Exploitation context

The CVE is not listed as KEV in the provided bundle. The public description supports remote, unauthenticated triggering under the vulnerable conditions, but the bundle does not provide confirmed exploitation in the wild.

Researcher notes

Impact is clear for denial of service; confidentiality and integrity impact are listed by CVSS but described publicly as unspecified. Treat memory corruption risk seriously, but avoid assuming exploitability beyond the cited sources.

Mitigation direction

  • Upgrade curl/libcurl to 7.57.0 or later where applicable.
  • Apply fixed vendor packages from Debian, Gentoo, Red Hat, or your platform vendor.
  • Inventory statically bundled libcurl copies inside applications and appliances.
  • Disable NTLM use where it is unnecessary or unsupported by business requirements.
  • Check vendor advisories for product-specific backports and package names.

Validation and detection

  • Confirm curl and libcurl versions on all 32-bit systems.
  • Identify applications that call libcurl with NTLM authentication enabled.
  • Check package manager advisories for the relevant fixed build.
  • Review embedded and appliance firmware for bundled vulnerable libcurl.
  • Verify remediation through version inventory, not only OS package status.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-190: Exact CWE lookup

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2017-8816 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

9.8Critical
CVSS 3.1 vector shape for CVE-2017-8816Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/acurl and libcurl before 7.57.0curl and libcurl before 7.57.0Listed
Weakness

CWE details

CWE-190

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.