8.8

CVE-2021-39537: apple mac_os_x Out-of-bounds Write

Modified
AliasesALPINE-CVE-2021-39537SUSE-SU-2021:3490-1SUSE-SU-2021:3491-1
Published 20-09-2021Last modified 08-10-2026

Vulnerability summary

CVE-2021-39537 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in apple mac_os_x. EPSS estimates a 3.24% chance of exploitation in the next 30 days, higher than 88.3% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
3.24%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 3 · Related 2
DLA-3682-1USN-5477-1USN-6099-1

Timeline

  1. 20-09-2021
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability information updated.

Description

An issue was discovered in ncurses through v6.2-1. _nc_captoinfo in captoinfo.c has a heap-based buffer overflow.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

3.24%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 3.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (lists.gnu.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Suse11 products
  • ncurses&distro=SUSE Linux Enterprise Micro 5.0< 6.1-5.9.1
  • ncurses&distro=SUSE Linux Enterprise Micro 5.1< 6.1-5.9.1
  • ncurses&distro=SUSE Linux Enterprise Module for Basesystem 15 SP2< 6.1-5.9.1
  • ncurses&distro=SUSE Linux Enterprise Module for Basesystem 15 SP3< 6.1-5.9.1
  • ncurses&distro=SUSE Linux Enterprise Module for Development Tools 15 SP2< 6.1-5.9.1
Apple2 products
Opensuse2 products
  • ncurses&distro=openSUSE Leap 15.2< 6.1-lp152.8.3.1
  • ncurses&distro=openSUSE Leap 15.3< 6.1-5.9.1
Alpine1 product
  • ncurses< 6.2_p20200523-r1 | < 6.2_p20200530-r0
Debian1 product
  • ncurses< 6.2+20200912-1
Invisible-island1 product
Ubuntu1 product
  • ncurses< 5.9+20140118-1ubuntu1+esm2 | < 6.0+20160213-1ubuntu1+esm2 | < 6.1-1ubuntu1.18.04.1 | < 6.2-0ubuntu2.1

7 vendors · 19 products

References

25 links
Show all 25 references