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CVE-2026-33985· NVD / CVE Program· CNA GitHub_M

FreeRDP: ClearCodec Glyph Cache Count Desync - Heap OOB Read

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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: 0.20% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: FreeRDP FreeRDP 3.24.2.

Low priority for now. Upgrade to FreeRDP FreeRDP 3.24.2 or later.

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

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, pixel data from adjacent heap memory is rendered to screen, potentially leaking sensitive data to the attacker. This issue has been patched in version 3.24.2.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Mar 30, 2026
Updated
Jun 17, 2026
EPSS
0.2% · 10th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.1
CNA · GitHub_M
5.9
1.2 point gap

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

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
  • A fix has been released

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

Follow CVE-2026-33985

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
freerdpfreerdp

Affected versions

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

  • freerdp freerdpbefore 3.24.2

Versions reported by the vendor

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

  • FreeRDP FreeRDP

    • < 3.24.2affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10freerdpbefore 2:3.10.3-5.el10_1.82:3.10.3-5.el10_1.8
AlmaLinux:10freerdp-develbefore 2:3.10.3-5.el10_1.82:3.10.3-5.el10_1.8
AlmaLinux:10freerdp-libsbefore 2:3.10.3-5.el10_1.82:3.10.3-5.el10_1.8
AlmaLinux:10freerdp-serverbefore 2:3.10.3-5.el10_1.82:3.10.3-5.el10_1.8
AlmaLinux:10libwinprbefore 2:3.10.3-5.el10_1.82:3.10.3-5.el10_1.8
AlmaLinux:10libwinpr-develbefore 2:3.10.3-5.el10_1.82:3.10.3-5.el10_1.8
AlmaLinux:8freerdpbefore 2:2.11.7-9.el8_102:2.11.7-9.el8_10
AlmaLinux:8freerdp-develbefore 2:2.11.7-9.el8_102:2.11.7-9.el8_10
AlmaLinux:8freerdp-libsbefore 2:2.11.7-9.el8_102:2.11.7-9.el8_10
AlmaLinux:8libwinprbefore 2:2.11.7-9.el8_102:2.11.7-9.el8_10
AlmaLinux:8libwinpr-develbefore 2:2.11.7-9.el8_102:2.11.7-9.el8_10
AlmaLinux:9freerdpbefore 2:2.11.7-7.el9_8.32:2.11.7-7.el9_8.3
AlmaLinux:9freerdpbefore 2:2.11.7-1.el9_7.72:2.11.7-1.el9_7.7
AlmaLinux:9freerdp-develbefore 2:2.11.7-1.el9_7.72:2.11.7-1.el9_7.7
AlmaLinux:9freerdp-develbefore 2:2.11.7-7.el9_8.32:2.11.7-7.el9_8.3
AlmaLinux:9freerdp-libsbefore 2:2.11.7-7.el9_8.32:2.11.7-7.el9_8.3
AlmaLinux:9freerdp-libsbefore 2:2.11.7-1.el9_7.72:2.11.7-1.el9_7.7
AlmaLinux:9libwinprbefore 2:2.11.7-1.el9_7.72:2.11.7-1.el9_7.7
AlmaLinux:9libwinprbefore 2:2.11.7-7.el9_8.32:2.11.7-7.el9_8.3
AlmaLinux:9libwinpr-develbefore 2:2.11.7-7.el9_8.32:2.11.7-7.el9_8.3
AlmaLinux:9libwinpr-develbefore 2:2.11.7-1.el9_7.72:2.11.7-1.el9_7.7
Debian:12freerdp2all versions—
Debian:13freerdp3before 3.15.0+dfsg-2.1+deb13u23.15.0+dfsg-2.1+deb13u2
Debian:14freerdp3before 3.24.2+dfsg-13.24.2+dfsg-1

+96

Same product

freerdp: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-8787FreeRDP prior to version 2.0.0-rc4 contains an Integer Overflow that leads to a Heap-Based Buffer Overflow in function gdi_Bitmap_Decompress
    42Plan
  • CVE-2018-8788FreeRDP prior to version 2.0.0-rc4 contains an Out-Of-Bounds Write of up to 4 bytes in function nsc_rle_decode() that results in a memory co
    41Plan
  • CVE-2018-8786FreeRDP prior to version 2.0.0-rc4 contains an Integer Truncation that leads to a Heap-Based Buffer Overflow in function update_read_bitmap_
    41Plan
  • CVE-2018-8785FreeRDP prior to version 2.0.0-rc4 contains a Heap-Based Buffer Overflow in function zgfx_decompress() that results in a memory corruption a
    41Plan
  • CVE-2018-8784FreeRDP prior to version 2.0.0-rc4 contains a Heap-Based Buffer Overflow in function zgfx_decompress_segment() that results in a memory corr
    41Plan
  • CVE-2024-32460FreeRDP Out-Of-Bounds Read in interleaved_decompress
    40Plan

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
FreeRDP FreeRDP3.24.2 · descriptionVendor (CNA)
almalinux:freerdp2:3.10.3-5.el10_1.8 · AlmaLinux:10Package registry (OSV)
almalinux:freerdp-devel2:3.10.3-5.el10_1.8 · AlmaLinux:10Package registry (OSV)
almalinux:freerdp-libs2:3.10.3-5.el10_1.8 · AlmaLinux:10Package registry (OSV)
almalinux:freerdp-server2:3.10.3-5.el10_1.8 · AlmaLinux:10Package registry (OSV)
almalinux:libwinpr2:3.10.3-5.el10_1.8 · AlmaLinux:10Package registry (OSV)
almalinux:libwinpr-devel2:3.10.3-5.el10_1.8 · AlmaLinux:10Package registry (OSV)
debian:freerdp33.15.0+dfsg-2.1+deb13u2 · Debian:13Package registry (OSV)
opensuse:freerdp3.24.2-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:freerdp2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:freerdp-debuginfo2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:freerdp-debugsource2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:freerdp-devel2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:freerdp-libs2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:freerdp-libs-debuginfo2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:freerdp-server2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:freerdp-server-debuginfo2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:libwinpr2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:libwinpr-debuginfo2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
red hat:libwinpr-devel2:3.10.3-5.el10_1.8 · Red Hat:enterprise_linux:10.1Package registry (OSV)
rocky linux:freerdp2:3.10.3-5.el10_1.8 · Rocky Linux:10Package registry (OSV)
suse:freerdp3.26.0-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

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.

Credits

All researchers

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

No credits in the CNA record.

Variant candidates

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

  • CVE-2026-3188517 days apartFreeRDP has an out-of-bounds read in ADPCM decoders due to missing predictor/step_index bounds checks
    37Monitor
  • CVE-2026-3189717 days apartFreeRDP has an out-of-bounds read in `freerdp_bitmap_decompress_planar`
    36Monitor
  • CVE-2026-67290124 days apartFreeRDP before 3.29.0 Heap Out-of-Bounds Read via TSMF
    34Monitor
  • CVE-2026-67291124 days apartFreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD
    34Monitor
  • CVE-2026-67301124 days apartFreeRDP before 3.29.0 Out-of-bounds Read via Polygon async message-proxy
    34Monitor
  • CVE-2026-339820 days apartFreeRDP: Persistent Cache Allocator Mismatch - Heap OOB Read
    32Monitor

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

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

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

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

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

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

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

All records