CVE-2020-27788 json
An out-of-bounds read access vulnerability was discovered in UPX in PackLinuxElf64::canPack() function of p_lx_elf.cpp file.
published 2022-08-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20290
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 26%
- public exploits
- 0
- none known
Summary
An out-of-bounds read access vulnerability was discovered in UPX in PackLinuxElf64::canPack() function of p_lx_elf.cpp file. An attacker with a crafted input file could trigger this issue that could cause a crash leading to a denial of service.
Patch / fix
- upx upx 3.96
- upx-ucl Debian 14, Debian 13 3.96-1
debian advisories DEBIAN-CVE-2020-27788
- github.com/upx/upx@1bb93d4 commit
- github.com/upx/upx/issues/332 advisory
Exploit prediction
0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/upx/upx/issues/332 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 |
Affected products
- n/a upx
Classification
- Weakness
-
- CWE-125 Out-of-bounds Read
References
-
github.com
/upx/upx/commit/1bb93d4fce9f1d764ba57bf5ac154af515b3fc83
patch, third-party-advisory
-
github.com
/upx/upx/issues/332
exploit, issue-tracking, patch, third-party-advisory
Sources
- CVE List CVE-2020-27788
- NVD CVE-2020-27788
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