CVE-2020-11525Public exploitNetwork attack vector

Client crash via bitmap cache off-by-one

Published May 15, 2020 · Updated Aug 4, 2024

Out-of-bounds read in FreeRDP allows remote attackers controlling an RDP server to crash a connecting client via crafted bitmap-cache data. bitmap_cache_get rejects a cache-cell identifier only when it exceeds maxCells, so an identifier equal to maxCells indexes one element beyond the allocated cells array. Exploitation requires the client to connect to an attacker-controlled RDP server, and the resulting invalid memory access can terminate that client.

CVSS severity2.2
Low
EPSS probability1.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in FreeRDP allows remote attackers controlling an RDP server to crash a connecting client via crafted bitmap-cache data. bitmap_cache_get rejects a cache-cell identifier only when it exceeds maxCells, so an identifier equal to maxCells indexes one element beyond the allocated cells array. Exploitation requires the client to connect to an attacker-controlled RDP server, and the resulting invalid memory access can terminate that client.

The record

CVE
CVE-2020-11525
Published
May 15, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

2.2OSVCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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