HOMEVULNERABILITIESCVE-2021-35963
CRITICAL

CVE-2021-35963

CWE-434Published: July 19, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The specific parameter of upload function of the Orca HCM digital learning platform does not filter file format, which allows remote unauthenticated attackers to upload files containing malicious script to execute RCE attacks.

NVD Source

Technical Analysis

CVE-2021-35963 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

learningdigital1 product(s)
orca hcm
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.chtsecurity.com/news/ba7b3ae7-14f3-4970-b3f6-4d97d8c7ea25
ADVISORYhttps://www.twcert.org.tw/tw/cp-132-4923-d68e6-1.html
ADVISORYhttps://www.chtsecurity.com/news/ba7b3ae7-14f3-4970-b3f6-4d97d8c7ea25
ADVISORYhttps://www.twcert.org.tw/tw/cp-132-4923-d68e6-1.html

All References (4)

→
https://www.chtsecurity.com/news/ba7b3ae7-14f3-4970-b3f6-4d97d8c7ea25Third Party Advisory
→
https://www.twcert.org.tw/tw/cp-132-4923-d68e6-1.htmlThird Party Advisory
→
https://www.chtsecurity.com/news/ba7b3ae7-14f3-4970-b3f6-4d97d8c7ea25Third Party Advisory
→
https://www.twcert.org.tw/tw/cp-132-4923-d68e6-1.htmlThird Party Advisory

Quick Facts

CVE IDCVE-2021-35963
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-434
CISA KEVNo
Affected1 vendor(s)
PublishedJul 19, 2021

Related CVEs (CWE-434)

CVE-2021-38397
10.0
CVE-2023-49815
10.0
CVE-2020-35489
10.0
CVE-2021-42645
10.0
CVE-2022-40981
10.0
CVE-2023-23656
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-35963 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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