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CVE-2021-3553· NVD / CVE Program· CNA Bitdefender

Server-Side Request Forgery in EPPUpdateService remote config file (VA-9825)

A Server-Side Request Forgery (SSRF) vulnerability in the EPPUpdateService of Bitdefender Endpoint Security Tools allows an attacker to use the Endpoint Protection relay as a proxy for any remote host. This issue affects: Bitdefender Endpoint Security Tools versions prior to 6.6.27.390; versions prior to 7.1.2.33. Bitdefender Unified Endpoint for Linux versions prior to 6.2.21.160. Bitdefender GravityZone versions prior to 6.24.1-1.

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
Nov 24, 2021
Updated
Jun 17, 2026
EPSS
1.3% · 68th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.3%

CNA vs NVD score

NVD
7.5
CNA · Bitdefender
5.3
2.2 point gap

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

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

Affected systems

VendorProduct
bitdefenderendpoint security tools
bitdefendergravityzone

Affected versions

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

  • bitdefender endpoint security toolsbefore 6.2.21.160
  • bitdefender endpoint security tools6.6.27.0 and later · before 6.6.27.390
  • bitdefender endpoint security tools7.0.0.00 and later · before 7.1.2.33
  • bitdefender gravityzone6.24.1-1

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 Endpoint Security Tools

    • unspecified and later · before 6.6.27.390affected
    • unspecified and later · before 7.1.2.33affected

  • Bitdefender GravityZone

    • unspecified and later · before 6.24.1-1affected

  • Bitdefender Unified Endpoint for Linux

    • unspecified and later · before 6.2.21.160affected

Same product

bitdefender: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-3554Improper Access Control vulnerability in the patchesUpdate API
    41Plan
  • CVE-2021-3579Incorrect Default Permissions vulnerability in bdservicehost.exe and Vulnerability.Scan.exe
    31Monitor
  • CVE-2021-3576Privilege escalation via SeImpersonatePrivilege
    31Monitor
  • CVE-2019-17099Untrusted Search Path vulnerability in EPSecurityService.exe (VA-3500)
    31Monitor
  • CVE-2022-0677Improper Handling of Length Parameter Inconsistency vulnerability in Bitdefender Update Server (VA-10144)
    30Monitor
  • CVE-2021-3552Insufficient validation on regular expression in EPPUpdateService config file (VA-9825)
    30Monitor

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

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

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-918 · Server-Side Request Forgery (SSRF)

CVSS vector

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

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.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

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

All records