CVE-2021-20505
CVE-2021-20505 is a medium-severity vulnerability in Ibm Powervm Hypervisor with a CVSS 3.x base score of 4.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: Medium (CVSS 3.x base score 4.4)
- CVSS v2: 3.5
- EPSS exploit prediction: 1% (42nd percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Ibm Powervm Hypervisor
- Published:
- Last modified:
Description
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
Frequently asked questions
- What is CVE-2021-20505?
- 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
- How severe is CVE-2021-20505?
- CVE-2021-20505 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2021-20505 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (42nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-20505?
- CVE-2021-20505 primarily affects Ibm Powervm Hypervisor. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-20505?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-20505 published?
- CVE-2021-20505 was published on 2021-07-29 and last updated on 2026-06-17.
References
- https://exchange.xforce.ibmcloud.com/vulnerabilities/198232
- https://www.ibm.com/support/pages/node/6475619
Affected products (4)
- cpe:2.3:o:ibm:powervm_hypervisor:fw920:*:*:*:*:*:*:*
- cpe:2.3:o:ibm:powervm_hypervisor:fw930:*:*:*:*:*:*:*
- cpe:2.3:o:ibm:powervm_hypervisor:fw940:*:*:*:*:*:*:*
- cpe:2.3:o:ibm:powervm_hypervisor:fw950:*:*:*:*:*:*:*
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