CVE-2021-39537

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 ImpacttotalSuccessful exploitation gives total 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

3.24% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 88.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Low. 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

2021-09-20 00:00Z5 YR AGO

Last updated

2026-10-08 21:03Z21 DAYS AGO

Reserved

2021-08-23

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

72977922bc01652c4671afe3221831d659070760625684f446d701ed557d78a5

• lists.gnu.orghttps://lists.gnu.org/archive/html/bug-ncurses/2020-08/msg00006.html
• lists.gnu.orghttps://lists.gnu.org/archive/html/bug-ncurses/2021-10/msg00023.html
• cvsweb.netbsd.orghttp://cvsweb.netbsd.org/bsdweb.cgi/pkgsrc/devel/ncurses/patches/patch-ncurses_tinfo_captoinfo.c?rev=1.1&content-type=text/x-cvsweb-markup
• support.apple.comhttps://support.apple.com/kb/HT213443
• support.apple.comhttps://support.apple.com/kb/HT213444
• support.apple.comhttps://support.apple.com/kb/HT213488
• seclists.org20221030 APPLE-SA-2022-10-27-5 Additional information for APPLE-SA-2022-10-24-2 macOS Ventura 13http://seclists.org/fulldisclosure/2022/Oct/41mailing-list
• seclists.org20221030 APPLE-SA-2022-10-24-2 macOS Ventura 13http://seclists.org/fulldisclosure/2022/Oct/28mailing-list
• seclists.org20221030 APPLE-SA-2022-10-27-7 Additional information for APPLE-SA-2022-09-12-4 macOS Monterey 12.6http://seclists.org/fulldisclosure/2022/Oct/43mailing-list
• seclists.org20221030 APPLE-SA-2022-10-27-9 Additional information for APPLE-SA-2022-09-12-3 macOS Big Sur 11.7http://seclists.org/fulldisclosure/2022/Oct/45mailing-list
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20230427-0012/
• lists.debian.org[debian-lts-announce] 20231203 [SECURITY] [DLA 3682-1] ncurses security updatehttps://lists.debian.org/debian-lts-announce/2023/12/msg00004.htmlmailing-list