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Fencer Vulns
high 7.8

CVE-2021-28021 json

Buffer overflow vulnerability in function stbi__extend_receive in stb_image.h in stb 2.26 via a crafted JPEG file.

published 2021-10-15 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14739

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

Buffer overflow vulnerability in function stbi__extend_receive in stb_image.h in stb 2.26 via a crafted JPEG file.

Patch / fix

  • libstb Debian 14, Debian 13, Debian 12 0.0~git20220908.8b5f1f3+ds-1

debian advisories DEBIAN-CVE-2021-28021

  • zxing-cpp SLE Workstation Extension 12 SP5, SLE Software Development Kit 12 SP5 1.2.0-8.6.1
  • zxing-cpp SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP3 1.2.0-9.7.1

suse advisories SUSE-SU-2022:0163-1SUSE-SU-2022:0157-1

  • zxing-cpp openSUSE Leap 15.3 1.2.0-9.7.1

opensuse advisories openSUSE-SU-2022:0157-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-28021 updated cvss 6.1

stb: buffer overflow in stbi__extend_receive() in stb_image.h via a crafted JPEG file

  • Red Hat Enterprise Linux 6 clutter
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 cogl, compat-libcogl12, compat-libcogl-pango12 Red Hat Enterprise Linux 8 cogl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.43% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/nothings/stb/issues/1108 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.