CVE-2019-25048 — LibreSSL 2

LibreSSL 2.9.1 through 3.2.1 has a heap-based buffer over-read in do_print_ex (called from asn1_item_print_ctx and ASN1_item_print).

01What is this vulnerability?

LibreSSL 2.9.1 through 3.2.1 has a heap-based buffer over-read in do_print_ex (called from asn1_item_print_ctx and ASN1_item_print).

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2021-07-01T02:53:25.000Z
• Last modified: 2024-08-05T03:00:19.156Z

09References

• github.com — https://github.com/libressl-portable/portable/commit/17c88164016df821df2dff4b2b1…
• bugs.chromium.org — https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=13914
• github.com — https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libressl/OSV-2020-1923.…