Out-of-bounds Read in Samba
CVE-2021-20277
A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.
Vulnerability class: Buffer Overflow
EPSS: 0.043 (90.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Samba
- Debian Debian_linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 32, 33, 34
- N/a Samba — versions samba 4.14.1, samba 4.13.6, samba 4.12.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
- secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
- secalert@redhat.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)
- secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
- secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
- secalert@redhat.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (x_refsource_MISC, Vendor Advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
Frequently asked questions
- What is CVE-2021-20277?
- CVE-2021-20277 is a high-severity vulnerability in Samba, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2021-05-12.
- How severe is CVE-2021-20277?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-20277 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.