How severe is CVE-2018-1000844?

CVE-2018-1000844 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2018-1000844 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1000844?

CVE-2018-1000844 affects Squareup Retrofit. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-1000844?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-1000844 published?

CVE-2018-1000844 was published on 2018-12-20 and last updated on 2026-06-17.

CVE-2018-1000844

CVE-2018-1000844 is a critical-severity vulnerability in Squareup Retrofit with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-611.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Squareup Retrofit
Published: 2018-12-20
Last modified: 2026-06-17

Description

Square Open Source Retrofit version Prior to commit 4a693c5aeeef2be6c7ecf80e7b5ec79f6ab59437 contains a XML External Entity (XXE) vulnerability in JAXB that can result in An attacker could use this to remotely read files from the file system or to perform SSRF.. This vulnerability appears to have been fixed in After commit 4a693c5aeeef2be6c7ecf80e7b5ec79f6ab59437.

Frequently asked questions

What is CVE-2018-1000844?: Square Open Source Retrofit version Prior to commit 4a693c5aeeef2be6c7ecf80e7b5ec79f6ab59437 contains a XML External Entity (XXE) vulnerability in JAXB that can result in An attacker could use this to remotely read files from the file system or to perform SSRF.. This vulnerability appears to have been fixed in After commit 4a693c5aeeef2be6c7ecf80e7b5ec79f6ab59437.
How severe is CVE-2018-1000844?: CVE-2018-1000844 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2018-1000844 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1000844?: CVE-2018-1000844 affects Squareup Retrofit. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-1000844?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-1000844 published?: CVE-2018-1000844 was published on 2018-12-20 and last updated on 2026-06-17.

References

https://github.com/square/retrofit/pull/2735

Affected products (1)

cpe:2.3:a:squareup:retrofit:*:*:*:*:*:*:*:*

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