What is CVE-2020-23878?

CVE-2020-23878 is a critical-severity vulnerability in Flowpaper Pdf2json, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-11-10.

How severe is CVE-2020-23878?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Flowpaper Pdf2json

CVE-2020-23878

pdf2json v0.71 was discovered to contain a stack buffer overflow in the component XRef::fetch.

Vulnerability class: Buffer Overflow

Published 2021-11-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.001

Affected products

Flowpaper Pdf2json — versions 0.71

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/flexpaper/pdf2json/issues/45 (Exploit, Third Party Advisory)
github.com/Aurorainfinity/Poc/tree/master/pdf2json (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-23878?: CVE-2020-23878 is a critical-severity vulnerability in Flowpaper Pdf2json, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-11-10.
How severe is CVE-2020-23878?: Critical severity. CVSS v3 base score is 9.8 out of 10.