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NVD / CVE Program· CNA GitHub_M

CVE-2020-11042: Out-of-bounds Read in FreeRDP

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: 1.7% (FIRST EPSS); higher than 77.9% of all records.
  • Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: FreeRDP FreeRDP 2.0.0.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to FreeRDP FreeRDP 2.0.0 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

Primary sources: NVD · CVE.org · FIRST EPSS

In FreeRDP greater than 1.1 and before 2.0.0, there is an out-of-bounds read in update_read_icon_info. It allows reading a attacker-defined amount of client memory (32bit unsigned -> 4GB) to an intermediate buffer. This can be used to crash the client or store information for later retrieval. This has been patched in 2.0.0.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
May 7, 2020
Updated
Jun 16, 2026
EPSS
1.7% · 77th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.7%

CNA vs NVD score

NVD
5.9
CNA · GitHub_M
5.5
0.4 point gap

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/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-2020-11042

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
debiandebian linux
canonicalubuntu linux

Affected versions

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

  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux19.10
  • canonical ubuntu linux20.04
  • debian debian linux10.0
  • debian debian linux9.0
  • freerdp freerdpafter 1.1.0 · before 2.0.0

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

    • > 1.1, < 2.0.0affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8freerdp-develbefore 2:2.1.1-1.el82:2.1.1-1.el8
AlmaLinux:8vinagrebefore 3.22.0-23.el83.22.0-23.el8
Debian:10freerdp2before 2.3.0+dfsg1-2+deb10u32.3.0+dfsg1-2+deb10u3
Debian:12freerdp2before 2.1.1+dfsg1-12.1.1+dfsg1-1
Debian:9freerdpbefore 1.1.0~git20140921.1.440916e+dfsg1-13+deb9u41.1.0~git20140921.1.440916e+dfsg1-13+deb9u4
Red Hat:enterprise_linux:7::clientfreerdpbefore 0:2.1.1-2.el70:2.1.1-2.el7
Red Hat:enterprise_linux:7::clientfreerdp-debuginfobefore 0:2.1.1-2.el70:2.1.1-2.el7
Red Hat:enterprise_linux:7::clientfreerdp-develbefore 0:2.1.1-2.el70:2.1.1-2.el7
Red Hat:enterprise_linux:7::clientfreerdp-libsbefore 0:2.1.1-2.el70:2.1.1-2.el7
Red Hat:enterprise_linux:7::clientlibwinprbefore 0:2.1.1-2.el70:2.1.1-2.el7
Red Hat:enterprise_linux:7::clientlibwinpr-develbefore 0:2.1.1-2.el70:2.1.1-2.el7
Red Hat:enterprise_linux:8::appstreamfreerdpbefore 2:2.1.1-1.el82:2.1.1-1.el8
Red Hat:enterprise_linux:8::appstreamfreerdp-debuginfobefore 2:2.1.1-1.el82:2.1.1-1.el8
Red Hat:enterprise_linux:8::appstreamfreerdp-debugsourcebefore 2:2.1.1-1.el82:2.1.1-1.el8
Red Hat:enterprise_linux:8::appstreamfreerdp-libsbefore 2:2.1.1-1.el82:2.1.1-1.el8
Red Hat:enterprise_linux:8::appstreamfreerdp-libs-debuginfobefore 2:2.1.1-1.el82:2.1.1-1.el8
Red Hat:enterprise_linux:8::appstreamlibwinprbefore 2:2.1.1-1.el82:2.1.1-1.el8
Red Hat:enterprise_linux:8::appstreamlibwinpr-debuginfobefore 2:2.1.1-1.el82:2.1.1-1.el8
Red Hat:enterprise_linux:8::appstreamlibwinpr-develbefore 2:2.1.1-1.el82:2.1.1-1.el8
Red Hat:enterprise_linux:8::appstreamvinagrebefore 0:3.22.0-23.el80:3.22.0-23.el8
Red Hat:enterprise_linux:8::appstreamvinagre-debuginfobefore 0:3.22.0-23.el80:3.22.0-23.el8
Red Hat:enterprise_linux:8::appstreamvinagre-debugsourcebefore 0:3.22.0-23.el80:3.22.0-23.el8
Red Hat:enterprise_linux:8::crbfreerdp-develbefore 2:2.1.1-1.el82:2.1.1-1.el8
Rocky Linux:8vinagrebefore 0:3.22.0-23.el80:3.22.0-23.el8

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

Published before and after this one in the same product

  • ← EarlierCVE-2019-17177Oct 4, 2019 · libfreerdp/codec/region.c in FreeRDP through 1.1.x and 2.x through 2.0.0-rc4 has memory leaks because a supplied realloc pointer (i.e., the
    31Monitor
  • ← EarlierCVE-2019-17178Oct 4, 2019 · HuffmanTree_makeFromFrequencies in lodepng.c in LodePNG through 2019-09-28, as used in WinPR in FreeRDP and other products, has a memory lea
    31Monitor
  • Later →CVE-2020-11044May 7, 2020 · Double Free in FreeRDP
    9Monitor

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 FreeRDP2.0.0 · descriptionVendor (CNA)
almalinux:freerdp-devel2:2.1.1-1.el8 · AlmaLinux:8Package registry (OSV)
almalinux:vinagre3.22.0-23.el8 · AlmaLinux:8Package registry (OSV)
debian:freerdp1.1.0~git20140921.1.440916e+dfsg1-13+deb9u4 · Debian:9Package registry (OSV)
debian:freerdp22.1.1+dfsg1-1 · Debian:12Package registry (OSV)
red hat:freerdp0:2.1.1-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:freerdp-debuginfo0:2.1.1-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:freerdp-debugsource2:2.1.1-1.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:freerdp-devel0:2.1.1-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:freerdp-libs0:2.1.1-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:freerdp-libs-debuginfo2:2.1.1-1.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libwinpr0:2.1.1-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:libwinpr-debuginfo2:2.1.1-1.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:libwinpr-devel0:2.1.1-2.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:vinagre0:3.22.0-23.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:vinagre-debuginfo0:3.22.0-23.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:vinagre-debugsource0:3.22.0-23.el8 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
rocky linux:vinagre0:3.22.0-23.el8 · Rocky Linux:8Package 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.

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

No known public program.

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

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • Administrator privileges are required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records