CVE-2018-15503

HIGHNVD 7.57.5—Trending — 3 sources updated this week

7.5

The unpack implementation in Swoole version 4.0.4 lacks correct size checks in the deserialization process. An attacker can craft a serialized object to exploit this vulnerability and cause a SEGV.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 81.2%
KEV: Not listed

Published

August 18, 2018

Last Modified

November 21, 2024

References (6)

cve@mitrehttps://github.com/swoole/swoole-src/commit/4cdbce5d9bf2fe596bb6acd7d6611f9e8c253a76
cve@mitrehttps://github.com/swoole/swoole-src/issues/1882
cve@mitrehttps://x-c3ll.github.io/posts/swoole-deserialization-cve-2018-15503/
af854a3a-2127-422b-91ae-364da2661108https://github.com/swoole/swoole-src/commit/4cdbce5d9bf2fe596bb6acd7d6611f9e8c253a76
af854a3a-2127-422b-91ae-364da2661108https://github.com/swoole/swoole-src/issues/1882
af854a3a-2127-422b-91ae-364da2661108https://x-c3ll.github.io/posts/swoole-deserialization-cve-2018-15503/

Weakness Classification(1)

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

CWE-502Deserialization of Untrusted Data

Data Freshness Timeline

(refreshed 12× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:49 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:28 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:41 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 03:57 UTCEG score recompute
2026-05-28 03:57 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2018-15503?

CVE-2018-15503 is a high vulnerability published on August 18, 2018. The unpack implementation in Swoole version 4.0.4 lacks correct size checks in the deserialization process. An attacker can craft a serialized object to exploit this vulnerability and cause a SEGV.

When was CVE-2018-15503 disclosed?

CVE-2018-15503 was first published in the National Vulnerability Database on August 18, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-15503 actively exploited?

CVE-2018-15503 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 81.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-15503?

CVE-2018-15503 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2018-15503?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-15503, 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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CVE-2018-15503

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-15503?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (6)

Frequently asked(5)

Related CVEs(same CWE)