CVE-2021-21704

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.87% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 77.8% of scored records. A rank, not a probability.

NVD base score

5.9 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-10-04 04:00Z4 YR AGO

Last updated

2024-09-17 00:45Z1 YR AGO

Reserved

2021-01-04

Assigning CNA

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Record state

PUBLISHED

Severity

Medium (CVSS 5.0)

CNA CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

Weaknesses

• CWE-125Out-of-bounds ReadBase
• CWE-190Integer Overflow or WraparoundBase
• CWE-787Out-of-bounds WriteBase
• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

938a9e5ae0ed20e6f5d6ee8b1cfc48940638065aef836c67529f7656aa9590e5

• bugs.php.nethttps://bugs.php.net/bug.php?id=76448x_refsource_MISC
• bugs.php.nethttps://bugs.php.net/bug.php?id=76449x_refsource_MISC
• bugs.php.nethttps://bugs.php.net/bug.php?id=76450x_refsource_MISC
• bugs.php.nethttps://bugs.php.net/bug.php?id=76452x_refsource_MISC
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20211029-0006/x_refsource_CONFIRM
• security.gentoo.orgGLSA-202209-20https://security.gentoo.org/glsa/202209-20vendor-advisoryx_refsource_GENTOO