CVE-2020-27507

CRITICALNVD 9.89.8—

9.8

The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 32.0%
KEV: Not listed

Published

March 15, 2023

Last Modified

February 27, 2025

References (6)

cve@mitrehttps://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685f
cve@mitrehttps://github.com/kamailio/kamailio/issues/2503
cve@mitrehttps://lists.debian.org/debian-lts-announce/2023/05/msg00030.html
af854a3a-2127-422b-91ae-364da2661108https://github.com/kamailio/kamailio/commit/ada3701d22b1fd579f06b4f54fa695fa988e685f
af854a3a-2127-422b-91ae-364da2661108https://github.com/kamailio/kamailio/issues/2503
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/05/msg00030.html

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	kamailio-memcached-modules (4.3.4-1.1ubuntu2.1+esm1) @ xenial	2026-05-25	ubuntu

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.

Weakness Classification(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

All Vendor Advisories

(1)

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.

UbuntuUSN-6022-1MEDIUM
Kamailio vulnerabilities

Data Freshness Timeline

(refreshed 10× in last 7d / 10× 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.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 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
2026-05-25 05:12 UTCEG score recompute
2026-05-25 05:12 UTCVendor advisory
2026-05-25 05:12 UTCGHSA enrichment
2026-05-24 11:51 UTCOSV refresh

Frequently asked(5)

What is CVE-2020-27507?

CVE-2020-27507 is a critical vulnerability published on March 15, 2023. The Kamailio SIP before 5.5.0 server mishandles INVITE requests with duplicated fields and overlength tag, leading to a buffer overflow that crashes the server or possibly have unspecified other impact.

When was CVE-2020-27507 disclosed?

CVE-2020-27507 was first published in the National Vulnerability Database on March 15, 2023, with the most recent update on February 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-27507 actively exploited?

CVE-2020-27507 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-27507?

CVE-2020-27507 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2020-27507?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-27507, 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.

Dependency Blast Radius

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CVE-2020-27507

Published

Last Modified

References (6)

Patch Availability(1)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-27507?

Same vendor

Same CWE

CVE-2020-27507

📅 Published

🔄 Last Modified

🔗 References (6)

Patch Availability(1)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-27507?

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References (6)

Frequently asked(5)

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