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NVD / CVE Program· CNA Bitdefender

CVE-2021-3641: Improper Link Resolution Before File Access in Bitdefender GravityZone (VA-9921)

MediumCVSS 6.1 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.35% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Improper Link Resolution Before File Access ('Link Following') vulnerability in the EPAG component of Bitdefender Endpoint Security Tools for Windows allows a local attacker to cause a denial of service. This issue affects: Bitdefender GravityZone version 7.1.2.33 and prior versions.

Published
Nov 9, 2021
Updated
Jun 17, 2026
EPSS
0.3% · 29th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CNA vs NVD score

NVD
6.1
CNA · Bitdefender
6.1
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-3641

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
bitdefendergravityzone
microsoftwindows

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Bitdefender). Independent of NVD's CPE analysis and usually ahead of it.

  • Bitdefender GravityZone

    • unspecified and later · up to and including 7.1.2.33affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • bitdefender gravityzoneup to 7.1.2.33 inclusive

Same product

bitdefender: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-8955The installer for BitDefender GravityZone relies on an encoded string in a filename to determine the URL for installation metadata, which…
    40Plan
  • CVE-2024-4177Host whitelist parser issue in GravityZone Console On-Premise (VA-11554)
    39Monitor
  • CVE-2022-2830Deserialization of Untrusted Data in GravityZone Console On-Premise (VA-10573)
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2017-8931Oct 30, 2018 · Bitdefender GravityZone VMware appliance before 6.2.1-35 might allow attackers to gain access with root privileges via unspecified vectors.
    39Monitor
  • ← EarlierCVE-2021-3823Oct 28, 2021 · Path traversal vulnerability in Bitdefender GravitZone Update Server in relay mode
    39Monitor
  • Later →CVE-2021-3959Dec 16, 2021 · Server-Side Request Forgery in Bitdefender GravityZone Update Server in Relay Mode (VA-10145)
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Not on record for this CVE: EPSS history · patch commit or PR link · variant or chain candidate.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

CWE-59 · Improper Link Resolution Before File Access ('Link Following')

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records