7.5

CVE-2016-0736: apache software foundation apache http server Cryptographic Issues

Modified
AliasesUBUNTU-CVE-2016-0736DEBIAN-CVE-2016-0736
Published 27-07-2017Last modified 16-09-2024

Vulnerability summary

CVE-2016-0736 is a high (CVSS 7.5) Cryptographic Issues vulnerability in apache software foundation apache http server. EPSS estimates a 49.02% chance of exploitation in the next 30 days, higher than 98.8% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (exploit-database, 23-12-2016)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
49.02%
0%100%
High · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1exploit-database

Advisory lineage

Upstream 0 · Downstream 9 · Related 3
DSA-3796-1MGASA-2018-0007RHSA-2017:0906RHSA-2017:1161RHSA-2017:1413RHSA-2017:1414

Timeline

  1. 27-07-2017
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

49.02%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

No change 0.00 pp

From 49.02% on 04-10-2026

04-10-202603-11-2026

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

1 found
  • exploit-databasemultipleUnverified

    Apache mod_session_crypto - Padding Oracle

    Maturity: poc

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.

Apache1 product
  • http_server2.4.0 | 2.4.1 | 2.4.2 | 2.4.3 | 2.4.6 | 2.4.7 | 2.4.8 | 2.4.9 | 2.4.10 | 2.4.12 | 2.4.14 | 2.4.16 | 2.4.19 | 2.4.20 | 2.4.21 | 2.4.22 | 2.4.23
Apache software foundation1 product
Debian1 product
  • apache2< 2.4.25-1
Ubuntu1 product
  • apache2< 2.4.7-1ubuntu4.15 | < 2.4.18-2ubuntu3.2

4 vendors · 4 products

References

33 links
Show all 33 references