CVE-2020-27171

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.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.57% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 47.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-08.

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

2021-03-20 21:41Z5 YR AGO

Last updated

2026-10-08 21:03Z20 DAYS AGO

Reserved

2020-10-16

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-193Off-by-one ErrorBase
• CWE-191Integer Underflow (Wrap or Wraparound)Base

Data version

5.2

Document digest

899ef379bd24b3ae2eeaadf74099a8628ee29576c41c7ca95ee3c6a242390284

• cdn.kernel.orghttps://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8x_refsource_MISC
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/03/19/3x_refsource_MISC
• git.kernel.orghttps://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/patch/?id=10d2bb2e6b1d8c4576c56a748f697dbeb8388899x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-f0181b8085https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-e49da8a226https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/vendor-advisoryx_refsource_FEDORA
• www.openwall.com[oss-security] 20210324 Re: [CVE-2020-27171] Numeric error when restricting speculative pointer arithmetic allows unprivileged local users to leak content of kernel memoryhttp://www.openwall.com/lists/oss-security/2021/03/24/5mailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2021-9503fffad9https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/vendor-advisoryx_refsource_FEDORA
• lists.debian.org[debian-lts-announce] 20210330 [SECURITY] [DLA 2610-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlmailing-listx_refsource_MLIST
• packetstormsecurity.comhttp://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.htmlx_refsource_MISC