The silc_pkcs1_decode function in the silccrypt library (silcpkcs1.c) in Secure Internet Live Conferencing (SILC) Toolkit before 1.1.7, SILC Client before 1.1.4, and SILC Server before 1.1.2 allows remote attackers to execute arbitrary code via a crafted PKCS#1 message, which triggers an integer underflow, signedness error, and a buffer overflow. NOTE: the researcher describes this as an integer overflow, but CVE uses the "underflow" term in cases of wraparound from unsigned subtraction.
Conclusion & alert: CVE-2008-1552 is rated Moderate Risk (57/100): CVSS Medium severity, with high exploitation likelihood (EPSS 6.73%, 91th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-05-21 | 8.69% | 6.73% | -1.96% |
| 2 | 2025-03-30 | 12.51% | 8.69% | -3.82% |
| 3 | 2025-03-29 | — | 12.51% | — |
Full EPSS history (13 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
gentoo
|
normal | CVE-2008-1552: 1 GLSA(s) (200804-27), 3 atom(s) (net-im/silc-client, net-im/silc-server, net-im/silc-toolkit); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2008-1552 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2008-1552 |
ubuntu
|
medium | CVE-2008-1552 medium priority: Ubuntu including 1 source packages (silc-client), 13 status rows across 13 suites (dapper, edgy, feisty, gutsy, hardy, intrepid, jaunty, karmic, lucid, maverick, natty, oneiric, upstream): not-affected 7, DNE 3, ignored 2, released 1. | https://ubuntu.com/security/CVE-2008-1552 |
Red Hat does not consider this issue to be a security flaw as SILC is not used in a vulnerable manner in Red Hat Enterprise Linux 4 and 5. More information can be found here: https://bugzilla.redhat.com/show_bug.cgi?id=440049
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| silc | silc_client | <= 1.1.3 | cpe:2.3:a:silc:silc_client:*:*:*:*:*:*:*:* |
| silc | silc_server | <= 1.1.2 | cpe:2.3:a:silc:silc_server:*:*:*:*:*:*:*:* |
| silc | silc_toolkit | <= 1.1.6 | cpe:2.3:a:silc:silc_toolkit:*:*:*:*:*:*:*:* |
| silc | silc | — | cpe:2.3:a:silc:silc:*:*:*:*:*:*:*:* |