9.8

CVE-2002-0059: zlib Double Free

CVSS: 9.8v3.1CriticalModified
Published 25-06-2002Last modified 08-08-2024
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Vulnerability summary

CVE-2002-0059 is a critical (CVSS 9.8) Double Free vulnerability in zlib. EPSS estimates a 9.69% chance of exploitation in the next 30 days, higher than 95.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
9.69%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-06-2002
    PublishedVulnerability first disclosed.
  2. 08-08-2024
    Last modifiedVulnerability information updated.

Description

The decompression algorithm in zlib 1.1.3 and earlier, as used in many different utilities and packages, causes inflateEnd to release certain memory more than once (a "double free"), which may allow local and remote attackers to execute arbitrary code via a block of malformed compression data.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

9.69%

Chance of exploitation in the next 30 days

Percentile

95%

Versus all other CVEs

30-day change

0.00 pp

From 9.69% on 19-09-2026

19-09-202619-10-2026
EPSS score
9.69%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Zlib1 product

1 vendor · 1 product

References

15 links
Show all 15 references