Buffer overflow in Upx
CVE-2020-27787
A Segmentaation fault was found in UPX in invert_pt_dynamic() function in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.
Vulnerability class: Buffer Overflow
Published · last modified .
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: 0.004 (33.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Upx
- Upx — versions Fixed in v3.96.
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/upx/upx/issues/333 (Exploit, Patch, Third Party Advisory, Issue Tracking)
- github.com/upx/upx/commit/e2f60adc95334f47e286838dac33160819c5d74d (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-27787?
- CVE-2020-27787 is a medium-severity vulnerability in Upx, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2022-08-18.
- How severe is CVE-2020-27787?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2020-27787 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.