CVE-2021-3377
MEDIUM
6.1
CVSS Score
Published: March 5, 2021 at 07:03 PM UTC
Updated: June 17, 2026 at 04:05 AM UTC
1 product affected across 1 vendorAnsi Up
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Severity
MEDIUM6.1
Exploit prediction
EPSS 8%
Description
The npm package ansi_up converts ANSI escape codes into HTML. In ansi_up v4, ANSI escape codes can be used to create HTML hyperlinks. Due to insufficient URL sanitization, this feature is affected by a cross-site scripting (XSS) vulnerability. This issue is fixed in v5.0.0.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
95%
v < 5.0.0
Affected range stops below 5.0.0, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (3)
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://doyensec.com/resources/Doyensec_Advisory_ansi_up4_XSS.pdfx_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/drudru/ansi_up/commit/c8c726ed1db979bae4f257b7fa41775155ba2e27Source: af854a3a-2127-422b-91ae-364da2661108
https://security.netapp.com/advisory/ntap-20241108-0002/CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- REQUIRED
- Scope
- CHANGED
- Confidentiality
- LOW
- Integrity
- LOW
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-79
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