What is CVE-2023-51451?

CVE-2023-51451 is a medium-severity vulnerability in Getsentry Symbolicator, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2023-12-22.

How severe is CVE-2023-51451?

Medium severity. CVSS v3 base score is 4.3 out of 10.

SSRF in Getsentry Symbolicator

CVE-2023-51451

Symbolicator is a service used in Sentry. Starting in Symbolicator version 0.3.3 and prior to version 21.12.1, an attacker could make Symbolicator send GET HTTP requests to arbitrary URLs with internal IP addresses by using an invalid protocol. The responses of those requests could be exposed via Symbolicator's API. In affected Sentry instances, the data could be exposed through the Sentry API and user interface if the attacker has a registered account. The issue has been fixed in Symbolicator release 23.12.1, Sentry self-hosted release 23.12.1, and has already been mitigated on sentry.io on December 18, 2023. If updating is not possible, some other mitigations are available. One may disable JS processing by toggling the option `Allow JavaScript Source Fetching` in `Organization Settings > Security & Privacy` and/or disable all untrusted public repositories under `Project Settings > Debug Files`. Alternatively, if JavaScript and native symbolication are not required, disable Symbolicator completely in `config.yml`.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2023-12-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (38.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Getsentry Symbolicator — versions >= 0.3.3, < 23.12.1
Sentry Symbolicator

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/getsentry/symbolicator/security/advisories/GHSA-ghg9-7m82-h96r (Patch, Mitigation, Vendor Advisory)
github.com/getsentry/symbolicator/pull/1343 (Patch)
github.com/getsentry/self-hosted/releases/tag/23.12.1 (Release Notes)
github.com/getsentry/symbolicator/releases/tag/23.12.1 (Release Notes)

Frequently asked questions

What is CVE-2023-51451?: CVE-2023-51451 is a medium-severity vulnerability in Getsentry Symbolicator, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.3/10. Published 2023-12-22.
How severe is CVE-2023-51451?: Medium severity. CVSS v3 base score is 4.3 out of 10.