9.8

CVE-2017-8923: php Out-of-bounds Write

Modified
AliasesSUSE-SU-2022:0530-1SUSE-SU-2022:0699-1UBUNTU-CVE-2017-8923
Published 12-05-2017Last modified 27-12-2024

Vulnerability summary

CVE-2017-8923 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in php. EPSS estimates a 7.19% chance of exploitation in the next 30 days, higher than 94.3% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
7.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 8 · Related 7
RHSA-2023:2903SUSE-SU-2022:0577-1SUSE-SU-2022:0679-1SUSE-SU-2022:4067-1SUSE-SU-2022:4068-1SUSE-SU-2022:4069-1

Timeline

  1. 12-05-2017
    PublishedVulnerability first disclosed.
  2. 27-12-2024
    Last modifiedVulnerability information updated.

Description

The zend_string_extend function in Zend/zend_string.h in PHP through 7.1.5 does not prevent changes to string objects that result in a negative length, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact by leveraging a script's use of .= with a long string.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

7.19%

Chance of exploitation in the next 30 days

Percentile

94%

Versus all other CVEs

30-day change

No change 0.00 pp

From 7.19% 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
  • referenceUnverified

    Exploit Reference (bugs.php.net)

    Maturity: unknown

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.

Suse4 products
  • php74&distro=SUSE Linux Enterprise Module for Web and Scripting 12< 7.4.6-1.33.1
  • php74&distro=SUSE Linux Enterprise Software Development Kit 12 SP5< 7.4.6-1.33.1
  • php7&distro=SUSE Linux Enterprise Module for Package Hub 15 SP3< 7.4.6-3.32.1
  • php7&distro=SUSE Linux Enterprise Module for Web and Scripting 15 SP3< 7.4.6-3.32.1
Ubuntu4 products
  • php5All versions (No fix recorded)
  • php7.0< 7.0.33-0ubuntu0.16.04.16+esm3
  • php7.2< 7.2.24-0ubuntu0.18.04.11
  • php7.4< 7.4.3-4ubuntu2.10
Opensuse2 products
  • php7-test&distro=openSUSE Leap 15.3< 7.4.6-3.32.1
  • php7&distro=openSUSE Leap 15.3< 7.4.6-3.32.1
Php1 product
  • php< 7.4.24 | ≥ 8.0.0, < 8.0.11

4 vendors · 11 products

References

14 links
Show all 14 references