CVE-2026-64621: FreeRDP before 3.28.0 Double-Free via selectedmonitors
Vulnerability summary
CVE-2026-64621 is a critical (CVSS 9.3) Double Free vulnerability in freerdp. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 30.1% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (GitHub, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 20-07-2026PublishedVulnerability first disclosed.
- 23-07-2026Last modifiedVulnerability information updated.
Description
FreeRDP before 3.28.0 (affected 3.x through 3.27.1) contains a double-free vulnerability in freerdp_client_rdp_file_apply_to_settings() (client/common/file.c) when parsing the selectedmonitors field of a .rdp connection file. The MonitorIds array is allocated through the settings object, and a raw non-owning pointer to it is freed on the strtoul error path without clearing settings->MonitorIds, leaving it dangling; at teardown freerdp_settings_free() frees the same buffer again. An attacker who convinces a victim to open a crafted .rdp file with oversized monitor tokens can trigger a size-controlled double-free in any FreeRDP CLI client (xfreerdp/sdl-freerdp/wlfreerdp) in the default configuration.
CVSS metrics
7 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.3CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- OSV · DebianEcosystem advisory · calculated9.3CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- NVDNIST9.3CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- OSV · UbuntuEcosystem advisory · calculated7.3HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
- NVDNIST7.3HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
EPSS trend
Probability
0.36%
Chance of exploitation in the next 30 days
Percentile
30%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.36% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundFreerdp
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu3 products
- freerdpAll versions (No fix recorded)
- freerdp2All versions (No fix recorded)
- freerdp3< 3.30.0+dfsg-0ubuntu0.24.04.1 | < 3.30.0+dfsg-0ubuntu0.26.04.1
Debian2 products
- freerdp2All versions (No fix recorded)
- freerdp3All versions (No fix recorded) | < 3.28.0+dfsg-1
Freerdp1 product
- freerdp< 3.28.0 | ≥ 3.0.0, < 3.28.0
3 vendors · 6 products
References
7 links- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-f27x-frr8-j9hcVendor AdvisoryREPORTExploitMitigation
- www.vulncheck.com/advisories/freerdp-before-double-free-via-selectedmonitorsThird Party AdvisoryPatch
