7.5

CVE-2016-6302: openssl Improper Input Validation

Modified
AliasesALPINE-CVE-2016-6302UBUNTU-CVE-2016-6302DEBIAN-CVE-2016-6302
Published 16-09-2016Last modified 06-08-2024

Vulnerability summary

CVE-2016-6302 is a high (CVSS 7.5) Improper Input Validation vulnerability in openssl. EPSS estimates a 27.81% chance of exploitation in the next 30 days, higher than 98.1% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 28% (FIRST, 04-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
27.81%
0%100%
High · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 7
DLA-637-1DSA-3673-1MGASA-2016-0338MGASA-2016-0408OPENSUSE-SU-2024:11127-1RHSA-2016:1940

Timeline

  1. 16-09-2016
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

Description

The tls_decrypt_ticket function in ssl/t1_lib.c in OpenSSL before 1.1.0 does not consider the HMAC size during validation of the ticket length, which allows remote attackers to cause a denial of service via a ticket that is too short.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

27.81%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

No change 0.00 pp

From 27.81% on 05-10-2026

05-10-202604-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Oracle2 products
Alpine1 product
  • openssl< 1.0.2h-r3
Debian1 product
  • openssl< 1.0.2i-1
Openssl1 product
  • opensslEOL1.0.1 | 1.0.1a | 1.0.1b | 1.0.1c | 1.0.1d | 1.0.1e | 1.0.1f | 1.0.1g | 1.0.1h | 1.0.1i | 1.0.1j | 1.0.1k | 1.0.1l | 1.0.1m | 1.0.1n | 1.0.1o | 1.0.1p | 1.0.1q | 1.0.1r | 1.0.1s | 1.0.1t | 1.0.2 | 1.0.2a | 1.0.2b | 1.0.2c | 1.0.2d | 1.0.2e | 1.0.2f | 1.0.2g | 1.0.2h
Ubuntu1 product
  • openssl< 1.0.1f-1ubuntu2.20 | < 1.0.2g-1ubuntu4.4

5 vendors · 6 products

References

32 links
Show all 32 references