Medium
Security advisory
In FreeRDP before version 2.1.2, there is an out of bounds read in RLEDECOMPRESS. All FreeRDP based clients with sessions with color depth < 32 are affected. This is fixed in version 2.1.2.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-4033
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:41 UTC · Revision 1
Source evidence
In FreeRDP before version 2.1.2, there is an out of bounds read in RLEDECOMPRESS. All FreeRDP based clients with sessions with color depth < 32 are affected. This is fixed in version 2.1.2.
osv:CVE-2020-4033
Complete source record
{
"id": "b389ce6e69a64c197d0d82429272e881f6706493a027bd3a8caa9bf7a6591e19",
"url": "https://osv.dev/vulnerability/CVE-2020-4033",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-4033",
"summary": "In FreeRDP before version 2.1.2, there is an out of bounds read in RLEDECOMPRESS. All FreeRDP based clients with sessions with color depth < 32 are affected. This is fixed in version 2.1.2.",
"evidence": "osv:CVE-2020-4033",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-4033",
"aliases": [
"CVE-2020-4033",
"GHSA-7rhj-856w-82p8"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/freerdp/freerdp",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "584efae073386e8c5f6bc265b05c87d508a9bcbc"
},
{
"fixed": "0a98c450c58ec150e44781c89aa6f8e7e0f571f5"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.1.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "0a98c450c58ec150e44781c89aa6f8e7e0f571f5"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"2.1.1",
"2.1.0",
"2.0.0",
"2.0.0-rc4",
"2.0.0-rc3",
"2.0.0-rc2",
"2.0.0-rc1",
"2.0.0-rc0",
"2.0.0-beta1+android11",
"2.0.0-beta1+android10",
"1.2.0-beta1+android9",
"1.2.0-beta1+android7",
"1.1.0-beta+2013071101",
"1.1.0-beta1+ios4",
"1.1.0-beta1+android5",
"1.1.0-beta1+android4",
"1.1.0-beta1+ios3",
"1.1.0-beta1+ios2",
"1.1.0-beta1+android3",
"1.1.0-beta1+android2",
"1.1.0-beta1+ios1",
"1.1.0-beta1",
"1.0.1",
"1.0.0",
"1.0-beta5",
"1.0-beta4",
"1.0-beta2",
"1.0-beta1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-4033.json",
"vanir_signatures": [
{
"id": "CVE-2020-4033-3cd1e04d",
"digest": {
"length": 4507,
"function_hash": "94257069752977040341272531883580787369"
},
"source": "https://github.com/freerdp/freerdp/commit/0a98c450c58ec150e44781c89aa6f8e7e0f571f5",
"target": {
"file": "libfreerdp/codec/include/bitmap.c",
"function": "RLEDECOMPRESS"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2020-4033-b8667d11",
"digest": {
"threshold": 0.9,
"line_hashes": [
"39066945076943679846899881374503470567",
"236360246893272756327673369714219300594",
"303072552976781912056663844091381197478",
"293101074181156110045527393670316470852",
"26103867433618001109866561315132363417",
"59463764602416359621987257370194610988",
"133926517239065278553257719413163608361",
"204282032633232275493298484655307215424",
"321749008865553814556823830518696463922",
"137304051175667516453654756671465560297",
"335363998141943889315488190711647841322",
"330507889033086119582898249029913691785",
"133926517239065278553257719413163608361",
"297258688963073114724819441908903814554",
"129912079427290320704623242374214830006",
"45854654747860260671680040004049018895",
"35369803322128794775560581700219326843",
"171162864366741136671138242120368466636",
"32843778905422824152611737245177932421",
"93051036519504234057740809413660568627",
"300239225307197318179262946557036985161"
]
},
"source": "https://github.com/freerdp/freerdp/commit/0a98c450c58ec150e44781c89aa6f8e7e0f571f5",
"target": {
"file": "libfreerdp/codec/include/bitmap.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T14:13:51Z"
}
}
],
"modified": "2026-10-20T14:13:51.487053155Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6Y35HBHG2INICLSGCIKNAR7GCXEHQACQ/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOZLH35OJWIQLM7FYDXAP2EAUBDXE76V/",
"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7rhj-856w-82p8",
"https://lists.debian.org/debian-lts-announce/2023/10/msg00008.html",
"https://usn.ubuntu.com/4481-1/",
"https://github.com/FreeRDP/FreeRDP/commit/0a98c450c58ec150e44781c89aa6f8e7e0f571f5"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "18.04"
},
{
"last_affected": "18.04"
},
{
"introduced": "20.04"
},
{
"last_affected": "20.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "31"
},
{
"last_affected": "31"
},
{
"introduced": "32"
},
{
"last_affected": "32"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"
],
"vendor_product": "opensuse:leap",
"extracted_events": [
{
"range": [
{
"introduced": "15.1"
},
{
"last_affected": "15.1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-4033",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388730,
"published_at": "2020-06-22T22:15:13.353+00:00"
}