CVE-2021-29873

IBM Flash System 900 could allow an authenticated attacker to obtain sensitive information and cause a denial of service due to a restricted shell escape vulnerability. IBM X-Force ID: 206229.

Published: 2021-10-21 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-29873 is rated Moderate Risk (58.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.48%). EPSS rose +1.05% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-29873

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.43% 1.48% +1.05%
2 2025-03-30 0.90% 0.43% -0.47%
3 2025-03-29 — 0.90% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-29873

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.2 [email protected]
8.8 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]
5.5 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 4.9 [email protected]

Weakness enumeration for CVE-2021-29873

Affected software / configurations for CVE-2021-29873

Vendor Product Version Raw CPE
ibm spectrum_virtualize >= 7.8.0.0, < 8.4.0.0 cpe:2.3:a:ibm:spectrum_virtualize:*:*:*:*:*:*:*:*
ibm spectrum_virtualize_for_public_cloud >= 7.8.0.0, < 8.4.0.0 cpe:2.3:a:ibm:spectrum_virtualize_for_public_cloud:*:*:*:*:*:*:*:*
ibm storwize_v3500_software >= 7.8.0.0, < 8.4.0.0 cpe:2.3:a:ibm:storwize_v3500_software:*:*:*:*:*:*:*:*
ibm storwize_v3700_software >= 7.8.0.0, < 8.4.0.0 cpe:2.3:a:ibm:storwize_v3700_software:*:*:*:*:*:*:*:*
ibm storwize_v5000_software >= 7.8.0.0, < 8.4.0.0 cpe:2.3:a:ibm:storwize_v5000_software:*:*:*:*:*:*:*:*
ibm storwize_v5100_software >= 7.8.0.0, < 8.4.0.0 cpe:2.3:a:ibm:storwize_v5100_software:*:*:*:*:*:*:*:*
ibm storwize_v7000_software >= 7.8.0.0, < 8.4.0.0 cpe:2.3:a:ibm:storwize_v7000_software:*:*:*:*:*:*:*:*
ibm san_volume_controller_firmware >= 7.8.0.0, < 8.4.0.0 cpe:2.3:o:ibm:san_volume_controller_firmware:*:*:*:*:*:*:*:*
ibm flashsystem_9100_firmware >= 7.8.0.0, < 8.4.0.0 cpe:2.3:o:ibm:flashsystem_9100_firmware:*:*:*:*:*:*:*:*
ibm flashsystem_9000_firmware >= 7.8.0.0, < 8.4.0.0 cpe:2.3:o:ibm:flashsystem_9000_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-29873

cvelogic Threat Intelligence