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CVE Record

CVE-2017-20199: Buttercup buttercup-browser-extension Vault access control

A vulnerability was found in Buttercup buttercup-browser-extension up to 0.14.2. Affected by this vulnerability is an unknown functionality of the component Vault Handler. The manipulation results in improper access controls. The attack may be performed from a remote location. A high complexity level is associated with this attack. The exploitation appears to be difficult. The exploit has been made public and could be used. Upgrading to version 1.0.1 addresses this issue. The patch is identified as 89. Upgrading the affected component is recommended. This vulnerability only affects products that are no longer supported by the maintainer.

LowCVSS 3.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2017-20199 affects old Buttercup browser extension versions up to 0.14.2. It is an improper access control issue in vault handling that could expose limited sensitive information. The rated severity is low because exploitation is difficult and requires user interaction, but affected software is unsupported and should not remain in use.

Executive priority

Handle through normal vulnerability management, not emergency response. Prioritize removal or upgrade because password-manager extensions handle sensitive data and the affected builds are unsupported, but current evidence supports low severity and no confirmed active exploitation.

Technical view

The issue is mapped to CWE-266 and CWE-284 and has CVSS 3.1 score 3.1. The vector indicates network reachability, high attack complexity, no privileges, required user interaction, unchanged scope, and low confidentiality impact only. Sources state upgrading to version 1.0.1 addresses the issue via pull request 89.

Likely exposure

Exposure is most likely limited to users or managed endpoints still running Buttercup buttercup-browser-extension versions 0.14.0, 0.14.1, or 0.14.2. The source states affected products are no longer supported by the maintainer, increasing operational risk despite low technical severity.

Exploitation context

The source bundle says a public exploit exists and could be used, but CISA KEV status is false and no active exploitation evidence is provided. Exploitation is described as remote but difficult, with high complexity and required user interaction.

Researcher notes

Evidence identifies the component as Vault Handler but does not describe the vulnerable code path in detail. Treat the GitHub issue, pull request 89, and v1.0.1 release as primary remediation context. Do not assume broader Buttercup products are affected without vendor evidence.

Mitigation direction

  • Inventory browsers for Buttercup browser extension versions up to 0.14.2.
  • Upgrade to Buttercup browser extension 1.0.1 where still applicable.
  • Remove unsupported Buttercup extension builds from managed endpoints.
  • Check vendor guidance before applying any nonstandard workaround.
  • If exposure is suspected, follow credential review and rotation procedures.

Validation and detection

  • Confirm installed Buttercup browser extension versions on managed browsers.
  • Verify no endpoint is running versions 0.14.0 through 0.14.2.
  • Document whether version 1.0.1 or removal resolved exposure.
  • Review extension allowlists and endpoint software inventory for unsupported builds.
Prepared
Confidence
medium
Sources
10

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-266: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cwe · medium confidence lookup

CWE-284: Authorization and privilege behavior lookup

Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2017-20199 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Low
CVSS
3.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C

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
7Source 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
3.1CVSS 3.1LowCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C1.61.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

3.1Low
CVSS 3.1 vector shape for CVE-2017-20199Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C

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
Buttercupbuttercup-browser-extension0.14.0, 0.14.1, 0.14.2, 1.0.1Listed
Weakness

CWE details

CWE-266CWE-284

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

CWE-266 · source CWE mapping

Incorrect Privilege Assignment

Incorrect Privilege Assignment represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-284 · source CWE mapping

Improper Access Control

Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs