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» CVE-2021-4103
Cross-site Scripting (XSS) - Stored in GitHub repository vanessa219/vditor prior to 1.0.34.
NVD Status： Modified ，CVE State: published
Threat Intelligence & Risk Assessment for CVE-2021-4103
Conclusion & alert: CVE-2021-4103 is rated Exploit Available (51.6/100) : CVSS Medium severity, with low exploitation likelihood (EPSS 0.21%).Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB).Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
Public exploit references (Exploit-DB) for CVE-2021-4103
EDB-ID
Source
Kind
Published
Link
—
nvd_ref
exploit_tag
Exploit-DB ↗
Exploit prediction scoring system (EPSS) score for CVE-2021-4103
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
#
Date
Old EPSS score
New EPSS score
Delta (New - Old)
1
2025-12-17
0.28%
0.21%
-0.07%
2
2025-11-21
0.21%
0.28%
+0.07%
3
2025-11-18
—
0.21%
—
Full EPSS history
(8 records total)
Common vulnerability scoring system (CVSS) metrics for CVE-2021-4103
CVSS metrics for this CVE.
Base score
Version
Severity
Vector
Exploitability
Impact
Score source
5.4
3.1
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
2.3
2.7
[email protected]
6.8
3.0
MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:L
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
2.1
4.7
[email protected]
3.5
2.0
LOW
AV:N/AC:M/Au:S/C:N/I:P/A:N
Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
6.8
2.9
[email protected]
Weakness enumeration for CVE-2021-4103
GitHub Security Advisory for CVE-2021-4103
GHSA-cxm3-v4mv-6mh8 · Severity: medium · Ecosystem: npm
— vditor Vulnerable to Cross-site Scripting in SVG events
Affected software / configurations for CVE-2021-4103
Vendor
Product
Version
Raw CPE
b3log
vditor
< 1.0.34
cpe:2.3:a:b3log:vditor:*:*:*:*:*:*:*:*
References for CVE-2021-4103
cvelogic
Threat Intelligence