What is CVE-2020-27583?

CVE-2020-27583 is a critical-severity vulnerability in IBM Infosphere Information Server, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-01-26.

How severe is CVE-2020-27583?

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

Deserialization in IBM Infosphere Information Server

CVE-2020-27583

IBM InfoSphere Information Server 8.5.0.0 is affected by deserialization of untrusted data which could allow remote unauthenticated attackers to execute arbitrary code. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Vulnerability class: Insecure Deserialization

Published 2021-01-26 · 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: 0.039 (90.0th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 90.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.037 · newest: 0.039 · change: +0.002

Affected products

IBM Infosphere Information Server — versions 8.5

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

n4nj0.github.io/advisories/ibm-infosphere-java-deserialization/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27583?: CVE-2020-27583 is a critical-severity vulnerability in IBM Infosphere Information Server, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-01-26.
How severe is CVE-2020-27583?: Critical severity. CVSS v3 base score is 9.8 out of 10.