CVE-2023-0568

CRITICALNVD 7.59.8
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-02-16. NVD baseline CVSS 7.5; sources differ by 2.3.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In PHP 8.0.X before 8.0.28, 8.1.X before 8.1.16 and 8.2.X before 8.2.3, core path resolution function allocate buffer one byte too small. When resolving paths with lengths close to system MAXPATHLEN setting, this may lead to the byte after the allocated buffer being overwritten with NUL value, which might lead to unauthorized data access or modification.

CVSS v3
7.5
EG Score
9.8CRITICALmedium confidence
EG Risk
45
EG Risk 45/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.2%
EPSS %ILE
68th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-22). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 16, 2023

Last Modified

February 13, 2025

Advisory Details (2)

Auto-updated Oct 15, 2026
Patch available.
Web page

PHP :: Sec Bug #81746 :: 1-byte array overrun in common path resolve code

https://bugs.php.net/bug.php?id=81746

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuphp7.0-snmp (7.0.33-0ubuntu0.16.04.16+esm5) @ xenial2026-10-23ubuntu
ubuntuphp8.1-snmp (8.1.7-1ubuntu3.3) @ kinetic2026-10-23ubuntu
redhatphp:7.4-8100020241113075828.f79986652024-12-11redhat
redhatphp:8.1-9030020231221080340.92024-01-24redhat
redhatphp-0:8.0.30-1.el9_22023-10-19redhat
redhatphp:8.0-8080020231006102311.0b4eb31d2023-10-19redhat

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.

Affected Packages

(3 across 3 ecosystems)
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
php7.37.3.10-1 ... 7.3.9-1~deb10u1 (17 versions)
  • every version up to 7.3.31-1~deb10u3: fixed in 7.3.31-1~deb10u3
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
php7.47.4.21-1+deb11u1 ... 7.4.33-1+deb11u1 (6 versions)
  • every version up to 7.4.33-1+deb11u3: fixed in 7.4.33-1+deb11u3
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
php8.2—
  • every version up to 8.2.4-1: fixed in 8.2.4-1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 28× in last 7d / 61× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 222 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 123 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 13:31 UTCEG score recompute
  2. 2026-10-23 13:31 UTCVendor advisory
  3. 2026-10-23 13:30 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-10-22 16:30 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  5. 2026-10-22 12:02 UTCEG score recompute
  6. 2026-10-22 12:02 UTCVendor advisory
  7. 2026-10-22 12:02 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-21 16:29 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  9. 2026-10-21 10:35 UTCEG score recompute
  10. 2026-10-21 10:35 UTCVendor advisory
  11. 2026-10-21 10:35 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  12. 2026-10-20 16:29 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  13. 2026-10-20 09:06 UTCEG score recompute
  14. 2026-10-20 09:06 UTCVendor advisory
  15. 2026-10-20 09:06 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-10-19 16:28 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  17. 2026-10-19 07:40 UTCEG score recompute
  18. 2026-10-19 07:40 UTCVendor advisory
  19. 2026-10-19 07:40 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-18 16:29 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  21. 2026-10-18 06:14 UTCEG score recompute
  22. 2026-10-18 06:14 UTCVendor advisory
  23. 2026-10-18 06:14 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-17 16:29 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  25. 2026-10-17 04:48 UTCEG score recompute
Show 74 more
  1. 2026-10-17 04:48 UTCVendor advisory
  2. 2026-10-17 04:48 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-16 16:35 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  4. 2026-10-16 03:22 UTCEG score recompute
  5. 2026-10-16 03:22 UTCVendor advisory
  6. 2026-10-16 03:22 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-15 16:28 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  8. 2026-10-15 00:03 UTCEG score recompute
  9. 2026-10-15 00:03 UTCVendor advisory
  10. 2026-10-15 00:03 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-14 16:29 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  12. 2026-10-13 19:13 UTCEG score recompute
  13. 2026-10-13 19:13 UTCVendor advisory
  14. 2026-10-13 19:12 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  15. 2026-10-13 16:29 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  16. 2026-10-12 17:46 UTCEG score recompute
  17. 2026-10-12 17:46 UTCVendor advisory
  18. 2026-10-12 17:45 UTCGHSA enrichmentGHSA-6gqv-38q3-6c47 · GitHub severity CRITICAL · GitHub CVSS 9.8
  19. 2026-10-12 16:30 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  20. 2026-10-11 22:03 UTCEG score recompute
  21. 2026-10-11 13:45 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  22. 2026-10-10 19:57 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  23. 2026-10-09 20:05 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  24. 2026-10-08 17:05 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  25. 2026-10-07 23:45 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  26. 2026-10-06 15:14 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  27. 2026-10-05 17:40 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  28. 2026-10-04 23:19 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  29. 2026-10-03 14:23 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  30. 2026-09-30 16:14 UTCEG score recompute
  31. 2026-09-30 15:01 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  32. 2026-09-27 13:42 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  33. 2026-09-26 15:55 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  34. 2026-09-26 00:22 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  35. 2026-09-24 14:00 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  36. 2026-09-23 20:11 UTCOSV refresh
  37. 2026-09-23 13:45 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  38. 2026-09-20 20:13 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  39. 2026-09-16 14:05 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  40. 2026-09-16 05:11 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  41. 2026-09-15 03:07 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  42. 2026-09-13 16:44 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  43. 2026-09-11 14:50 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  44. 2026-09-11 09:34 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  45. 2026-09-08 21:57 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  46. 2026-09-07 15:59 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  47. 2026-09-06 13:45 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  48. 2026-09-05 15:25 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  49. 2026-09-04 14:59 UTCOSV refresh
  50. 2026-09-04 13:57 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  51. 2026-09-04 05:04 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  52. 2026-09-02 14:09 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  53. 2026-09-01 13:51 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  54. 2026-08-30 19:15 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  55. 2026-08-30 01:19 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  56. 2026-08-28 21:38 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  57. 2026-08-27 14:22 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  58. 2026-08-26 14:43 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  59. 2026-08-25 13:46 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  60. 2026-08-23 00:17 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  61. 2026-08-21 23:46 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  62. 2026-08-20 22:53 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  63. 2026-08-19 17:01 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  64. 2026-08-18 13:45 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  65. 2026-08-18 02:22 UTCOSV refresh
  66. 2026-08-17 13:44 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  67. 2026-08-16 14:53 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  68. 2026-08-16 02:12 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  69. 2026-08-15 01:27 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  70. 2026-08-13 21:58 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  71. 2026-08-12 13:48 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  72. 2026-08-09 13:44 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  73. 2026-08-08 16:34 UTCEPSS rescoreEPSS 1.2% · 66th percentile
  74. 2026-08-07 16:24 UTCEPSS rescoreEPSS 1.2% · 66th percentile

Frequently asked(5)

What is CVE-2023-0568?
CVE-2023-0568 is a critical-severity vulnerability; its CVE record was published on February 16, 2023. In PHP 8.0.X before 8.0.28, 8.1.X before 8.1.16 and 8.2.X before 8.2.3, core path resolution function allocate buffer one byte too small. When resolving paths with lengths close to system MAXPATHLEN setting, this may lead to the byte after the allocated buffer being overwritten with NUL value,…
When was CVE-2023-0568 made public?
CVE-2023-0568 was made public on February 13, 2023: that is the date its CVE record's CNA, PHP Group, gives for when the vulnerability was made public. The CVE record itself was published on February 16, 2023. EchelonGraph's copy of the record carries a last-modified date of February 13, 2025; the record at its source may have been updated since.
Is CVE-2023-0568 actively exploited?
CVE-2023-0568 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% probability of exploitation in the next 30 days (68th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-0568?
CVE-2023-0568 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8 (CRITICAL).
How do I remediate CVE-2023-0568?
A fix for CVE-2023-0568 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-0568 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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