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CVE-2016-6309: openssl Use After Free

CVSS: 10.0v2.0HighModified
Published 26-09-2016Last modified 06-08-2024
Open JSON

Vulnerability summary

CVE-2016-6309 is a high (CVSS 10.0) Use After Free vulnerability in openssl. EPSS estimates a 70.22% chance of exploitation in the next 30 days, higher than 99.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
10.0/10
010
High · v2.0 (NVD)
EPSS score
70.22%
0%100%
Critical · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
MGASA-2016-0408

Timeline

  1. 26-09-2016
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

Description

statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a denial of service (use-after-free) or possibly execute arbitrary code via a crafted TLS session.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

70.22%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

+0.06 pp

From 70.16% on 21-09-2026

21-09-202621-10-2026
EPSS score
70.22%

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

Openssl1 product

1 vendor · 1 product

References

14 links
Show all 14 references