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Fencer Vulns
medium 5.5

CVE-2021-3508 json

A flaw was found in PDFResurrect in version 0.22b.

published 2021-04-28 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26827

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

A flaw was found in PDFResurrect in version 0.22b. There is an infinite loop in get_xref_linear_skipped() in pdf.c via a crafted PDF file.

Patch / fix

  • pdfresurrect Debian 14, Debian 13, Debian 12 0.22-3

debian advisories DEBIAN-CVE-2021-3508

  • pdfresurrect Ubuntu Pro 16.04 LTS 0.12-6ubuntu0.2+esm1
  • pdfresurrect Ubuntu Pro 18.04 LTS 0.14-1ubuntu0.1~esm1
  • pdfresurrect Ubuntu Pro 20.04 LTS 0.19-1ubuntu0.1~esm1
  • pdfresurrect Ubuntu Pro 22.04 LTS 0.22-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-3508

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2021-3508 updated cvss 5.5

pdfresurrect: infinite loop in get_xref_linear_skipped() in pdf.c

  • Red Hat All currently supported Red Hat products
    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

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/enferex/pdfresurrect/issues/17 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • n/a PDFResurrect

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.