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CVE-2025-4444

Tor Onion Service Descriptor resource consumption

6.3 MediumFix available

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.47%Up 0.4 points since Sep 19, 2025
90%50%10%1%

What each source reports

CVE List Score used 6.3

Tor Onion Service Descriptor resource consumption

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.

Record
CVE-2025-4444
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
CVSS 3.0
3.7 LowCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
CVSS 2.0
2.6 AV:N/AC:H/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C
Weakness
CWE-400, CWE-404
Updated
2026-11-02
EUVDEUVD-2025-29912 6.3

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.

Record
EUVD-2025-29912
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X
Updated
2026-11-02
GitHub AdvisoriesGHSA-qc3c-vmf8-hgcj 6.3

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown...

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.

Record
GHSA-qc3c-vmf8-hgcj
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-400
Updated
2026-11-02
NVD 6.3

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.

Record
CVE-2025-4444
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 2.0
2.6 LowAV:N/AC:H/Au:N/C:N/I:N/A:P
Weakness
CWE-400, CWE-404
Updated
2026-11-02
OSV 3.7

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.

Record
CVE-2025-4444
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2025-4444 6.3

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.

Record
DEBIAN-CVE-2025-4444
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2025-4444 6.3

A security flaw has been discovered in Tor up to 0.4.7.16/0.4.8.17. Impacted is an unknown function of the component Onion Service Descriptor Handler. Performing manipulation results in resource consumption. The attack may be initiated remotely. The attack's complexity is rated as high. The exploitability is considered difficult. Upgrading to version 0.4.8.18 and 0.4.9.3-alpha is recommended to address this issue. It is recommended to upgrade the affected component.

Record
UBUNTU-CVE-2025-4444
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVMGASA-2026-0187 No score

Updated tor packages fix security issues

This update provides lots of security issues fixed by upstream since our current version. Please see the links for details.

Record
MGASA-2026-0187
Updated
2026-11-02
OSVopenSUSE-SU-2025:15571-1 No score

tor-0.4.8.18-1.1 on GA media

These are all security issues fixed in the tor-0.4.8.18-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:15571-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tor
Debian:12
 before 0.4.9.6-0+deb12u1, plus listed versions
0.4.7.13-10.4.7.16-10.4.8.10-10.4.8.10-1~bpo11+10.4.8.10-1~bpo12+1
Show 32 moreShow less
0.4.8.11-10.4.8.11-1~bpo11+10.4.8.11-1~bpo12+10.4.8.12-10.4.8.12-1.10.4.8.12-1~bpo11+10.4.8.12-1~bpo12+10.4.8.13-10.4.8.13-20.4.8.13-2~bpo12+10.4.8.14-10.4.8.14-1~bpo12+10.4.8.16-10.4.8.21-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+20.4.8.22-10.4.8.22-1~bpo12+10.4.8.22-1~bpo13+10.4.8.4-20.4.8.5-10.4.8.6-10.4.8.7-10.4.8.8-10.4.8.9-10.4.8.9-1~bpo11+10.4.8.9-1~bpo12+10.4.9.5-10.4.9.5-20.4.9.5-2~bpo12+10.4.9.5-2~bpo13+1
0.4.9.6-0+deb12u1
tor
Debian:13
 before 0.4.9.6-0+deb13u1, plus listed versions
0.4.8.16-10.4.8.21-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+2
Show 7 moreShow less
0.4.8.22-10.4.8.22-1~bpo12+10.4.8.22-1~bpo13+10.4.9.5-10.4.9.5-20.4.9.5-2~bpo12+10.4.9.5-2~bpo13+1
0.4.9.6-0+deb13u1
tor
Debian:14
 before 0.4.8.21-1, plus listed versions
0.4.8.16-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+2
0.4.8.21-1
tor
Mageia:9
From an advisory covering 7 CVEs
 before 0.4.9.8-1.mga9
0.4.9.8-1.mga9
tor
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
0.2.3.25-10.2.4.19-10.2.4.20-10.2.4.27-1build0.14.04.10.2.4.27-1ubuntu0.10.2.4.27-1ubuntu0.1+esm10.2.4.27-1ubuntu0.1+esm2
 None known
tor
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
0.2.6.10-1ubuntu20.2.7.6-1ubuntu10.2.9.11-1ubuntu1~16.04.10.2.9.14-1ubuntu1~16.04.10.2.9.14-1ubuntu1~16.04.20.2.9.14-1ubuntu1~16.04.30.2.9.14-1ubuntu1~16.04.3+esm1
 None known
tor
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
0.3.0.10-10.3.1.8-20.3.1.9-10.3.2.9-10.3.2.9-1build1
Show 4 moreShow less
0.3.2.10-10.3.2.10-1ubuntu0.10.3.2.10-1ubuntu0.2~esm10.3.2.10-1ubuntu0.2~esm2
 None known
tor
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
0.4.1.5-10.4.1.5-1build10.4.1.6-10.4.2.5-10.4.2.6-10.4.2.7-10.4.2.7-1ubuntu0.1~esm1
 None known
tor
Ubuntu:22.04:LTS
 All versions, plus listed versions
0.4.5.9-10.4.6.8-10.4.6.8-1build10.4.6.9-10.4.6.10-10.4.9.11-0ubuntu0.22.04.1
 None known
tor
Ubuntu:24.04:LTS
 All versions, plus listed versions
0.4.8.4-20.4.8.7-10.4.8.9-10.4.8.10-10.4.8.10-1build10.4.8.10-1build20.4.9.11-0ubuntu0.24.04.1
 None known
Show 4 moreShow less
Affected packages
PackageAffectedFixed
tor
Ubuntu:25.10
 All versions, plus listed versions
0.4.8.14-10.4.8.16-1
 None known
tor
Ubuntu:26.10
 All versions, plus listed versions
0.4.9.6-10.4.9.8-10.4.9.11-10.4.9.11-1build1
 None known
tor
Ubuntu:26.04:LTS
 All versions, plus listed versions
0.4.8.16-10.4.8.21-10.4.8.22-10.4.9.6-10.4.9.11-0ubuntu0.26.04.1
 None known
tor
openSUSE:Tumbleweed
 before 0.4.8.18-1.1
0.4.8.18-1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-4444 is a medium vulnerability (CVSS 6.3) in Torproject Tor, published September 18, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.47%, the 41st percentile. Fixed in tor 0.4.9.6-0+deb12u1.

References

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