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CVE-2020-4337: IBM API Connect 2018.4.1.0 through 2018.4.1.12 could allow an attacker to launch phishing attacks by tricki...

IBM API Connect 2018.4.1.0 through 2018.4.1.12 could allow an attacker to launch phishing attacks by tricking the server to generate user registration emails that contain malicious URLs. IBM X-Force ID: 177933.

MediumCVSS 6.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

IBM API Connect could be abused to send registration emails containing attacker-controlled malicious URLs. This is primarily a phishing risk: recipients may trust the email because it comes from a legitimate API Connect system. The listed impact is medium, but it can create credible social-engineering paths against users and administrators.

Executive priority

Treat this as a moderate-priority remediation item for affected API Connect environments. It is not described as actively exploited, but it can undermine trust in legitimate registration emails and support credential theft or user redirection campaigns.

Technical view

CVE-2020-4337 affects IBM API Connect 2018.4.1.0 through 2018.4.1.12. An unauthenticated network attacker could trick the server into generating user registration emails with malicious URLs. The CVSS 3.0 score is 6.5 with high integrity impact, low complexity, no privileges required, and user interaction required.

Likely exposure

Exposure is most likely where IBM API Connect 2018.4.1.0 through 2018.4.1.12 is deployed and user registration email workflows are enabled or reachable. The source bundle does not identify other IBM products or later versions as affected.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation. CVSS marks exploit maturity as unproven. Practical abuse would depend on reaching the registration-email workflow and convincing a recipient to follow the malicious link.

Researcher notes

The source bundle does not provide exploit details, named patches, or configuration-specific mitigations. Analysis should stay tied to IBM API Connect 2018.4.1.0 through 2018.4.1.12 and the registration-email URL generation behavior described by IBM and CVE records.

Mitigation direction

  • Inventory IBM API Connect deployments and confirm exact 2018.4.1.x fix levels.
  • Review IBM advisory guidance for the official fix or upgrade path.
  • Upgrade or patch affected 2018.4.1.0 through 2018.4.1.12 instances per IBM guidance.
  • Limit exposure of registration workflows where operationally possible.
  • Monitor registration email activity for unexpected domains or unusual request patterns.

Validation and detection

  • Confirm whether any IBM API Connect instance runs 2018.4.1.0 through 2018.4.1.12.
  • Check whether user registration email generation is enabled or externally reachable.
  • Review registration email templates and generated links for unexpected external domains.
  • Inspect logs for abnormal registration-email generation volume or suspicious referrers.
  • Verify remediation status against the IBM support advisory.
Prepared
Confidence
high
Sources
4

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.

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CVE-2020-4337 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.5 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/I:H/AV:N/PR:N/A:N/UI:R/AC:L/S:U/C:N/RC:C/E:U/RL:O

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
3Source 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
6.5CVSS 3.0MediumCVSS:3.0/I:H/AV:N/PR:N/A:N/UI:R/AC:L/S:U/C:N/RC:C/E:U/RL:O2.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

6.5Medium
CVSS 3.0 vector shape for CVE-2020-4337Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/I:H/AV:N/PR:N/A:N/UI:R/AC:L/S:U/C:N/RC:C/E:U/RL:O

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
IBMAPI Connect2018.4.1.0, 2018.4.1.12Listed
Weakness

CWE details

No CWE listed

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