CVE-2017-12933

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 7%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

The finish_nested_data function in ext/standard/var_unserializer.re in PHP before 5.6.31, 7.0.x before 7.0.21, and 7.1.x before 7.1.7 is prone to a buffer over-read while unserializing untrusted data. Exploitation of this issue can have an unspecified impact on the integrity of PHP.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
93.3%
KEV
Not listed

Published

August 18, 2017

Last Modified

May 13, 2026

Advisory Details (7)

Auto-updated Jun 24, 2026
Patch available. Sources: redhat.
generic

PHP: PHP 5 ChangeLog

http://php.net/ChangeLog-5.php
generic

[SECURITY] [DSA 4081-1] php5 security update

https://www.debian.org/security/2018/dsa-4081
generic

[SECURITY] [DSA 4080-1] php7.0 security update

https://www.debian.org/security/2018/dsa-4080
generic

PHP :: Sec Bug #74111 :: Heap buffer overread (READ: 1) finish_nested_data from unserialize

https://bugs.php.net/bug.php?id=74111
redhat Patch Available
https://access.redhat.com/errata/RHSA-2018:1296
generic
http://www.securityfocus.com/bid/99490
generic

PHP: PHP 7 ChangeLog

http://php.net/ChangeLog-7.php

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuphp5-xsl (5.5.9+dfsg-1ubuntu4.23) @ trusty2026-05-20ubuntu
ubuntulibphp5-embed (5.5.9+dfsg-1ubuntu4.29+esm2) @ trusty2026-05-20ubuntu
redhatrh-php70-php-0:7.0.27-1.el72018-05-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 13:42 UTCEPSS rescore
  2. 2026-07-06 16:24 UTCEPSS rescore
  3. 2026-07-06 02:20 UTCEPSS rescore
  4. 2026-07-05 02:27 UTCEPSS rescore
  5. 2026-07-04 06:28 UTCEPSS rescore
  6. 2026-07-01 15:02 UTCEPSS rescore
  7. 2026-07-01 15:02 UTCEPSS rescore
  8. 2026-06-30 23:19 UTCEPSS rescore
  9. 2026-06-30 23:19 UTCEPSS rescore
  10. 2026-06-28 04:53 UTCEPSS rescore
  11. 2026-06-27 03:05 UTCEPSS rescore
  12. 2026-06-25 13:47 UTCEPSS rescore
  13. 2026-06-25 13:47 UTCEPSS rescore
  14. 2026-06-24 14:02 UTCEPSS rescore
  15. 2026-06-23 21:30 UTCEPSS rescore
  16. 2026-06-21 14:54 UTCEPSS rescore
  17. 2026-06-21 14:54 UTCEPSS rescore
  18. 2026-06-19 19:23 UTCEPSS rescore
  19. 2026-06-19 19:23 UTCEPSS rescore
  20. 2026-06-19 15:55 UTCOSV refresh
  21. 2026-06-18 17:50 UTCEPSS rescore
  22. 2026-06-17 17:50 UTCEPSS rescore
  23. 2026-06-16 17:50 UTCEPSS rescore
  24. 2026-06-15 17:45 UTCEPSS rescore
  25. 2026-06-14 23:14 UTCEPSS rescore
Show 63 more
  1. 2026-06-14 23:14 UTCEPSS rescore
  2. 2026-06-13 22:57 UTCEPSS rescore
  3. 2026-06-12 23:09 UTCEPSS rescore
  4. 2026-06-11 13:57 UTCEPSS rescore
  5. 2026-06-10 22:15 UTCEPSS rescore
  6. 2026-06-07 15:22 UTCEPSS rescore
  7. 2026-06-07 15:22 UTCEPSS rescore
  8. 2026-06-06 13:45 UTCEPSS rescore
  9. 2026-06-06 13:45 UTCEPSS rescore
  10. 2026-06-05 22:44 UTCEPSS rescore
  11. 2026-06-04 13:10 UTCEPSS rescore
  12. 2026-06-04 13:10 UTCEPSS rescore
  13. 2026-06-02 20:11 UTCEPSS rescore
  14. 2026-06-02 20:11 UTCEPSS rescore
  15. 2026-06-01 13:49 UTCEPSS rescore
  16. 2026-06-01 13:49 UTCEPSS rescore
  17. 2026-05-31 22:28 UTCEPSS rescore
  18. 2026-05-31 00:14 UTCEPSS rescore
  19. 2026-05-30 22:23 UTCOSV refresh
  20. 2026-05-29 13:41 UTCEPSS rescore
  21. 2026-05-28 13:42 UTCEPSS rescore
  22. 2026-05-28 13:42 UTCEPSS rescore
  23. 2026-05-27 13:38 UTCEPSS rescore
  24. 2026-05-27 13:38 UTCEPSS rescore
  25. 2026-05-26 13:42 UTCEPSS rescore
  26. 2026-05-26 13:42 UTCEPSS rescore
  27. 2026-05-26 07:17 UTCEPSS rescore
  28. 2026-05-26 07:17 UTCEPSS rescore
  29. 2026-05-20 22:37 UTCEPSS rescore
  30. 2026-05-20 22:37 UTCEPSS rescore
  31. 2026-05-20 11:21 UTCEPSS rescore
  32. 2026-05-20 11:21 UTCEPSS rescore
  33. 2026-05-20 08:58 UTCEG score recompute
  34. 2026-05-20 08:58 UTCVendor advisory
  35. 2026-05-20 08:58 UTCGHSA enrichment
  36. 2026-05-20 05:14 UTCEG score recompute
  37. 2026-05-20 05:14 UTCVendor advisory
  38. 2026-05-20 05:14 UTCGHSA enrichment
  39. 2026-05-20 01:30 UTCEG score recompute
  40. 2026-05-20 01:30 UTCVendor advisory
  41. 2026-05-20 01:30 UTCGHSA enrichment
  42. 2026-05-19 21:47 UTCEG score recompute
  43. 2026-05-19 21:47 UTCVendor advisory
  44. 2026-05-19 21:47 UTCGHSA enrichment
  45. 2026-05-19 18:04 UTCEG score recompute
  46. 2026-05-19 18:04 UTCVendor advisory
  47. 2026-05-19 18:04 UTCGHSA enrichment
  48. 2026-05-19 14:20 UTCEG score recompute
  49. 2026-05-19 14:20 UTCVendor advisory
  50. 2026-05-19 14:20 UTCGHSA enrichment
  51. 2026-05-19 10:36 UTCEG score recompute
  52. 2026-05-19 10:36 UTCVendor advisory
  53. 2026-05-19 10:36 UTCGHSA enrichment
  54. 2026-05-19 06:51 UTCEG score recompute
  55. 2026-05-19 06:51 UTCVendor advisory
  56. 2026-05-19 06:51 UTCGHSA enrichment
  57. 2026-05-19 03:08 UTCEG score recompute
  58. 2026-05-19 03:08 UTCVendor advisory
  59. 2026-05-19 03:07 UTCGHSA enrichment
  60. 2026-05-18 23:24 UTCEG score recompute
  61. 2026-05-18 23:24 UTCVendor advisory
  62. 2026-05-18 21:30 UTCEPSS rescore
  63. 2026-05-18 21:30 UTCEPSS rescore

Frequently asked(5)

What is CVE-2017-12933?
CVE-2017-12933 is a critical vulnerability published on August 18, 2017. The finishnesteddata function in ext/standard/var_unserializer.re in PHP before 5.6.31, 7.0.x before 7.0.21, and 7.1.x before 7.1.7 is prone to a buffer over-read while unserializing untrusted data. Exploitation of this issue can have an unspecified impact on the integrity of PHP.
When was CVE-2017-12933 disclosed?
CVE-2017-12933 was first published in the National Vulnerability Database on August 18, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-12933 actively exploited?
CVE-2017-12933 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-12933?
CVE-2017-12933 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-12933?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-12933, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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