CVE-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.
02 Description
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.
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 2.20% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 82.2% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-10-14.
- 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.
04 Metadata
- Published
- 2022-08-24 00:00Z4 YR AGO
- Last updated
- 2026-10-14 09:54Z15 DAYS AGO
- Reserved
- 2021-11-22
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- Data version
- 5.2
- Document digest
- 1d3f2eda039c432f33698c0986089307e7eec4647c8b267736018c0ebbac83d0
05 Affected products
06 References
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2022/01/24/4
- sourceware.orghttps://sourceware.org/bugzilla/show_bug.cgi?id=28770
- sourceware.orghttps://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=ee8d5e33adb284601c00c94687bc907e10aec9bb
- sourceware.orghttps://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=84d2d0fe20bdf94feed82b21b4d7d136db471f03
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2024633
- access.redhat.comhttps://access.redhat.com/security/cve/CVE-2021-3998
- security-tracker.debian.orghttps://security-tracker.debian.org/tracker/CVE-2021-3998
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20221020-0003/
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-831302.html
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html
07 Fixed in
Arch Linux
- glibc Fixed in 2.34-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
Debian 12
- glibc Fixed in 2.33-4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- glibc Fixed in 2.33-4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- glibc Fixed in 2.33-4
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.