CVE-2021-39521

MEDIUM

6.5

CVSS Score

Published: September 20, 2021 at 03:26 PM UTC

Updated: June 17, 2026 at 04:03 AM UTC

1 product affected across 1 vendorLibreDWG

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.9%

Description

An issue was discovered in libredwg through v0.10.1.3751. A NULL pointer dereference exists in the function bit_read_BB() located in bits.c. It allows an attacker to cause Denial of Service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

LibreDWG · Gnuc-cpp

95%

v ≤ 0.10.1.3751

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/LibreDWG/libredwg/issues/262

References (1)

x_refsource_MISCExploitIssue TrackingPatchThird Party Advisory

Source: [email protected]

https://github.com/LibreDWG/libredwg/issues/262

CVSS

6.5MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-476

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