What is CVE-2019-20805?

CVE-2019-20805 is a medium-severity vulnerability in Upx, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2020-06-01.

How severe is CVE-2019-20805?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Integer overflow in Upx

CVE-2019-20805

p_lx_elf.cpp in UPX before 3.96 has an integer overflow during unpacking via crafted values in a PT_DYNAMIC segment.

Vulnerability class: Integer Overflow

Published 2020-06-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (53.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

github.com/upx/upx/commit/8be9da8280dfa69d5df4417d4d81bda1cab78010 (Patch, Third Party Advisory)
github.com/upx/upx/issues/317 (Third Party Advisory)

Frequently asked questions

What is CVE-2019-20805?: CVE-2019-20805 is a medium-severity vulnerability in Upx, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2020-06-01.
How severe is CVE-2019-20805?: Medium severity. CVSS v3 base score is 5.5 out of 10.