CVE-2021-20505

lowpriority · track · 18OT risk · elevatedEPSS 0.005 · 46 %ileEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.55% (46th) EPSS
CVSS 3.5 · low
Is it mine?
8 products
Check your exposure
Who says so?
3 sources
cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

The PowerVM Logical Partition Mobility(LPM) (PowerVM Hypervisor FW920, FW930, FW940, and FW950) encryption key exchange protocol can be compromised. If an attacker has the ability to capture encrypted LPM network traffic and is able to gain service access to the FSP they can use this information to perform a series of PowerVM service procedures to decrypt the captured migration traffic IBM X-Force ID: 198232

01

cvss

Technical severity, 0–10. One row per scoring source.

4.4
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.5–4.4

v2.03.5lowAV:N/AC:M/Au:S/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 2.9
v3.14.4mediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 0.7 · impact 3.6
v3.04.4mediumCVSS:3.0/UI:N/S:U/I:N/C:H/AC:H/PR:H/AV:N/A:N/RC:C/RL:O/E:Usecondary · ENISA EU
v3.04.4mediumCVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:Nsecondary · psirt@us.ibm.com USexploitability 0.7 · impact 3.6
v3.14.1mediumCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)
02

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-321USLLM-inferred
03

affected products (8)

Products and version ranges known to be affected.

04

also known as (3)

Other names and identifiers for this entity.

05

sources

Which sources assert this record, and when.

cnnvdenisa_euvdnvdNVDCVE.orgMITRE
published 2021-07-29modified 2026-06-17
06

references (8)

External citations — patches, advisories, analysis.

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