Vulnerability · CVE-2021-3998
A flaw was found in glibc.
Published Aug 24, 2022 · catalog updated Oct 14, 2026 · A flaw was found
Check if you run it
No confirmed exploitation is on record for CVE-2021-3998. EPSS is 2.07%. Act only if a listed version of A flaw was found is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
- No version range is stored. A customer cannot check an installed version against this record.
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 2.07%
- Remediation
- Advisory link
- Affected products
- cpe gnu/glibc · cpe netapp/h300s firmware · cpe netapp/h410c firmware · cpe netapp/h410s firmware · cpe netapp/h500s firmware · cpe netapp/h700s firmware
A flaw was found in glibc. The realpath() function can mistakenly return an unexpected value, potentially leading to information leakage and disclosure of sensitive data.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe gnu/glibcversion unspecified
- cpe netapp/h300s firmwareversion unspecified
- cpe netapp/h410c firmwareversion unspecified
- cpe netapp/h410s firmwareversion unspecified
- cpe netapp/h500s firmwareversion unspecified
- cpe netapp/h700s firmwareversion unspecified
- cpe netapp/ontap select deploy administration utilityversion unspecified
How to fix CVE-2021-3998
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2021-3998. EPSS is 2.07%. Act only if a listed version of A flaw was found is installed.
Which versions are affected?
Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-125: Out-of-bounds Read; CWE-252: Unchecked Return Value. EPSS 2.07%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Aug 24, 2022 · NIST NVD
Detected
A flaw was found in glibc. The realpath() function can mistakenly return an unexpected value, potentially leading to information leakage and disclosure of sensitive data.
Oct 14, 2026 · NIST NVD
Updated
A flaw was found in glibc. The realpath() function can mistakenly return an unexpected value, potentially leading to information leakage and disclosure of sensitive data.
Sources
- CVE.orgVulnerability recordCVE-2021-3998
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2021-3998
30-day exploitation probability 2.1%
first.org - NIST NVDVulnerability recordCVE-2021-3998
A flaw was found in glibc. The realpath() function can mistakenly return an unexpected value, potentially leading to information leakage and disclosure of sensitive data.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.