CVE-2023-35133
Moodle: ssrf risk due to insufficient check on the curl blocked hosts
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Moodle: ssrf risk due to insufficient check on the curl blocked hosts
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
- Record
CVE-2023-35133- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
EUVDEUVD-2023-1920
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
- Record
EUVD-2023-1920- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xxp4-mf4h-6cwm
Moodle vulnerable to Server Side Request Forgery
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
- Record
GHSA-xxp4-mf4h-6cwm- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
NVD
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
- Record
CVE-2023-35133- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
OSV
Moodle: ssrf risk due to insufficient check on the curl blocked hosts
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
- Record
CVE-2023-35133- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
OSVGHSA-xxp4-mf4h-6cwm
Moodle vulnerable to Server Side Request Forgery
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
- Record
GHSA-xxp4-mf4h-6cwm- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2023-35133
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
- Record
UBUNTU-CVE-2023-35133- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVBIT-moodle-2023-35133 No score
Moodle: ssrf risk due to insufficient check on the curl blocked hosts
An issue in the logic used to check 0.0.0.0 against the cURL blocked hosts lists resulted in an SSRF risk. This flaw affects Moodle versions 4.2, 4.1 to 4.1.3, 4.0 to 4.0.8, 3.11 to 3.11.14, 3.9 to 3.9.21 and earlier unsupported versions.
- Record
BIT-moodle-2023-35133- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
moodle/moodlePackagist |
4.2.0 to 4.2.0 | 4.2.1 |
moodle/moodlePackagist |
4.1.0 up to 4.1.4 | 4.1.4 |
moodle/moodlePackagist |
4.0.0 up to 4.0.9 | 4.0.9 |
moodle/moodlePackagist |
3.10.0 up to 3.11.15 | 3.11.15 |
moodle/moodlePackagist |
before 3.9.22 | 3.9.22 |
moodleBitnami |
before 3.9.22, 3.11.0 up to 3.11.15, 4.0.0 up to 4.0.9, 4.1.0 up to 4.1.4, 4.2.0 up to 4.2.1 | 3.9.223.11.154.0.94.1.44.2.1 |
moodle/moodlePackagist |
4.2.0 up to 4.2.1, plus listed versions v4.2.0 |
4.2.1 |
moodle/moodlePackagist |
4.1.0 up to 4.1.4, plus listed versions v4.1.0v4.1.1v4.1.2v4.1.3 |
4.1.4 |
moodle/moodlePackagist |
4.0.0 up to 4.0.9, plus listed versions v4.0.0v4.0.1v4.0.2v4.0.3v4.0.4 Show 4 moreShow lessv4.0.5v4.0.6v4.0.7v4.0.8 |
4.0.9 |
moodle/moodlePackagist |
3.10.0 up to 3.11.15, plus listed versions v3.10.0v3.10.1v3.10.10v3.10.11v3.10.2 Show 25 moreShow lessv3.10.3v3.10.4v3.10.5v3.10.6v3.10.7v3.10.8v3.10.9v3.11.0v3.11.0-betav3.11.0-rc1v3.11.0-rc2v3.11.1v3.11.10v3.11.11v3.11.12v3.11.13v3.11.14v3.11.2v3.11.3v3.11.4v3.11.5v3.11.6v3.11.7v3.11.8v3.11.9 |
3.11.15 |
moodle/moodlePackagist |
before 3.9.22, plus listed versions v2.3.10v2.3.11v2.3.4v2.3.5v2.3.6 Show 45 moreShow lessv2.3.7v2.3.8v2.3.9v2.4.0v2.4.0-rc1v2.4.1v2.4.10v2.4.11v2.4.2v2.4.3v2.4.4v2.4.5v2.4.6v2.4.7v2.4.8v2.4.9v2.5.0v2.5.0-betav2.5.0-rc1v2.5.1v2.5.2v2.5.3v2.5.4v2.5.5v2.5.6v2.5.7v2.5.8v2.5.9v2.6.0v2.6.0-betav2.6.0-rc1v2.6.1v2.6.10v2.6.11v2.6.2v2.6.3v2.6.4v2.6.5v2.6.6v2.6.7v2.6.8v2.6.9v2.7.0v2.7.0-betav2.7.0-rc1 |
3.9.22 |
moodleUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 2.7.9+dfsg-12.7.10+dfsg-12.7.11+dfsg-12.7.11+dfsg-22.7.12+dfsg-13.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1 |
None known |
moodleUbuntu:Pro:18.04:LTS |
All versions, plus listed versions 3.0.3+dfsg-0ubuntu13.0.3+dfsg-0ubuntu1+esm1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2023-35133 is a high vulnerability (CVSS 7.5) in Moodle, published June 22, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.83%, the 57th percentile. Fixed in moodle/moodle 4.2.1.
References
bugzilla.redhat.com/show_bug.cgi?id=2214373
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7A72KX4WU6GK2CX4TKYFGFASPKOEOJFC
moodle.org/mod/forum/discuss.php?d=447831
nvd.nist.gov/vuln/detail/CVE-2023-35133
git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-78215
Show 8 moreShow less
github.com/advisories/GHSA-xxp4-mf4h-6cwm
ubuntu.com/security/CVE-2023-35133
cve.org/CVERecord?id=CVE-2023-35133
Left out here: 219 versions. The JSON record has them.