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CVE-2021-21702

Null Dereference in SoapClient

Medium5.3EPSS 3.2%
Published
Updated
Reserved
Assigned by
php

Description

In PHP versions 7.3.x below 7.3.27, 7.4.x below 7.4.15 and 8.0.x below 8.0.2, when using SOAP extension to connect to a SOAP server, a malicious SOAP server could return malformed XML data as a response that would cause PHP to access a null pointer and thus cause a crash.

Timeline

  1. ID reserved

    By php

  2. · 42 days later

    Published

  3. · 4 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2021-21702, by who scored it
Scored byCVSSScoreVector
phpCNA (assigner)3.1Medium5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVDNVD · Modified3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
3.2% · top 12% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

Affected products

  • PHP Group · PHP

    • affected 7.3.x – < 7.3.27
    • affected 7.4.x – < 7.4.15
    • affected 8.0.X – < 8.0.2

References (7)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .