CVE-2025-4877
Publication date 25 June 2025
Last updated 29 August 2025
Ubuntu priority
There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libssh | 25.04 plucky |
Fixed 0.11.1-1ubuntu0.1
|
| 24.04 LTS noble |
Fixed 0.10.6-2ubuntu0.1
|
|
| 22.04 LTS jammy |
Fixed 0.9.6-2ubuntu0.22.04.4
|
|
| 20.04 LTS focal |
Fixed 0.9.3-2ubuntu2.5+esm1
|
|
| 18.04 LTS bionic |
Fixed 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4
|
|
| 16.04 LTS xenial |
Fixed 0.6.3-4.3ubuntu0.6+esm2
|
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Get Ubuntu Pro 30-day free trialSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
4.5 · Medium
|
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | Low |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L |
References
Related Ubuntu Security Notices (USN)
- USN-7619-1
- libssh vulnerabilities
- 7 July 2025
- USN-7696-1
- libssh vulnerabilities
- 14 August 2025