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TI-2020-08912 Aliases CVE-2020-11038

Integer Overflow to Buffer Overflow in FreeRDP

Priority LOW 33CWE-680Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · High · Low
Fix status
Partial Red Hat: 8 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

In FreeRDP less than or equal to 2.0.0, an Integer Overflow to Buffer Overflow exists. When using /video redirection, a manipulated server can instruct the client to allocate a buffer with a smaller size than requested due to an integer overflow in size calculation. With later messages, the server can manipulate the client to write data out of bound to the previously allocated buffer. This has been patched in 2.1.0.

Why it matters now

EPSS 0.01211 68th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 8 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
FreeRDPFreeRDPup to 2.0.0—No fix listedCNA
  • FreeRDP VendorFreeRDP Affected up to 2.0.0 Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*before 2.1.0VulnerableFreeRDP
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
  • cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:* Versions before 2.1.0 Vulnerable ·FreeRDP
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

Red Hat 2 advisories

  • RHSA-2020:4647 Released 2020-11-04 · Red Hat rating Moderate
    freerdp and vinagre security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) freerdp-devel-2:2.1.1-1.el8
    • Red Hat Enterprise Linux AppStream (v. 8) freerdp-2:2.1.1-1.el8, freerdp-libs-2:2.1.1-1.el8, libwinpr-2:2.1.1-1.el8 +2
  • RHSA-2020:4031 Released 2020-09-29 · Red Hat rating Moderate
    freerdp security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) freerdp-2.1.1-2.el7, freerdp-libs-2.1.1-2.el7, libwinpr-2.1.1-2.el7
    • Red Hat Enterprise Linux Client Optional (v. 7) freerdp-devel-2.1.1-2.el7, libwinpr-devel-2.1.1-2.el7
    • Red Hat Enterprise Linux Server (v. 7) freerdp-2.1.1-2.el7, freerdp-libs-2.1.1-2.el7, freerdp-libs-2.1.1-2.el7.ppc +2
    • Red Hat Enterprise Linux Server Optional (v. 7) freerdp-devel-2.1.1-2.el7, freerdp-devel-2.1.1-2.el7.ppc, libwinpr-devel-2.1.1-2.el7 +1
    • Red Hat Enterprise Linux Workstation (v. 7) freerdp-2.1.1-2.el7, freerdp-libs-2.1.1-2.el7, libwinpr-2.1.1-2.el7
    • Red Hat Enterprise Linux Workstation Optional (v. 7) freerdp-devel-2.1.1-2.el7, libwinpr-devel-2.1.1-2.el7

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2020:4647
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:4647
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:4031
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2020:4031
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4031
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:4031
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4031
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2020:4031

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-11038

References

Advisory 3

  • TI-2026-85092 Use-after-free in FreeRDP rdpgfx channel close handling CVSS 4.0CRITICAL 9.3
  • TI-2026-85091 Out-of-bounds write in FreeRDP proxy via bitmap cache v2 capability CVSS 4.0CRITICAL 9.3
  • TI-2026-24435 FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write CVSS 3.1CRITICAL 9.8
  • TI-2023-21373 Out-Of-Bounds Write in FreeRDP CVSS 3.1CRITICAL 9.8
  • TI-2022-08692 Server side NTLM does not properly check parameters in FreeRDP CVSS 3.1CRITICAL 9.1
  • TI-2023-21374 Out-Of-Bounds Read in FreeRDP CVSS 3.1CRITICAL 9.1
See all 336 →

Sources

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